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	diff --git a/sipsimple/session.py b/sipsimple/session.py
	index d7cf9806..034d9f5f 100644
	--- a/sipsimple/session.py
	+++ b/sipsimple/session.py
	@@ -1,2686 +1,2687 @@

	"""
	Implements an asynchronous notification based mechanism for
	establishment, modification and termination of sessions using Session
	Initiation Protocol (SIP) standardized in RFC3261.
	"""

	from __future__ import absolute_import

	__all__ = ['Session', 'SessionManager']

	import random

	from threading import RLock
	from time import time

	from application import log
	from application.notification import IObserver, Notification, NotificationCenter, NotificationData
	from application.python import Null, limit
	from application.python.decorator import decorator, preserve_signature
	from application.python.types import Singleton
	from application.system import host
	from eventlib import api, coros, proc
	from twisted.internet import reactor
	from zope.interface import implements

	from sipsimple.core import DialogID, Engine, Invitation, Referral, Subscription, PJSIPError, SIPCoreError, SIPCoreInvalidStateError, SIPURI, sip_status_messages, sipfrag_re
	from sipsimple.core import ContactHeader, FromHeader, Header, ReasonHeader, ReferToHeader, ReplacesHeader, RouteHeader, ToHeader, WarningHeader
	from sipsimple.core import SDPConnection, SDPMediaStream, SDPSession

	from sipsimple.account import AccountManager, BonjourAccount
	from sipsimple.configuration.settings import SIPSimpleSettings
	from sipsimple.core import PublicGRUU, PublicGRUUIfAvailable, NoGRUU
	from sipsimple.lookup import DNSLookup, DNSLookupError
	from sipsimple.payloads import ParserError
	from sipsimple.payloads.conference import ConferenceDocument
	from sipsimple.streams import MediaStreamRegistry, InvalidStreamError, UnknownStreamError
	from sipsimple.threading import run_in_twisted_thread
	from sipsimple.threading.green import Command, run_in_green_thread
	from sipsimple.util import ISOTimestamp


	class InvitationDisconnectedError(Exception):
	def __init__(self, invitation, data):
	self.invitation = invitation
	self.data = data


	class MediaStreamDidNotInitializeError(Exception):
	def __init__(self, stream, data):
	self.stream = stream
	self.data = data


	class MediaStreamDidFailError(Exception):
	def __init__(self, stream, data):
	self.stream = stream
	self.data = data


	class SubscriptionError(Exception):
	def __init__(self, error, timeout, **attributes):
	self.error = error
	self.timeout = timeout
	self.attributes = attributes


	class SIPSubscriptionDidFail(Exception):
	def __init__(self, data):
	self.data = data


	class InterruptSubscription(Exception):
	pass


	class TerminateSubscription(Exception):
	pass


	class ReferralError(Exception):
	def __init__(self, error, code=0):
	self.error = error
	self.code = code


	class TerminateReferral(Exception):
	pass


	class SIPReferralDidFail(Exception):
	def __init__(self, data):
	self.data = data


	class IllegalStateError(RuntimeError):
	pass


	class IllegalDirectionError(RuntimeError):
	pass


	class SIPInvitationTransferDidFail(Exception):
	def __init__(self, data):
	self.data = data


	@decorator
	def transition_state(required_state, new_state):
	def state_transitioner(func):
	@preserve_signature(func)
	def wrapper(obj, args, *kwargs):
	with obj._lock:
	if obj.state != required_state:
	raise IllegalStateError('cannot call %s in %s state' % (func.__name__, obj.state))
	obj.state = new_state
	return func(obj, args, *kwargs)
	return wrapper
	return state_transitioner


	@decorator
	def check_state(required_states):
	def state_checker(func):
	@preserve_signature(func)
	def wrapper(obj, args, *kwargs):
	if obj.state not in required_states:
	raise IllegalStateError('cannot call %s in %s state' % (func.__name__, obj.state))
	return func(obj, args, *kwargs)
	return wrapper
	return state_checker


	@decorator
	def check_transfer_state(direction, state):
	def state_checker(func):
	@preserve_signature(func)
	def wrapper(obj, args, *kwargs):
	if obj.transfer_handler.direction != direction:
	raise IllegalDirectionError('cannot transfer in %s direction' % obj.transfer_handler.direction)
	if obj.transfer_handler.state != state:
	raise IllegalStateError('cannot transfer in %s state' % obj.transfer_handler.state)
	return func(obj, args, *kwargs)
	return wrapper
	return state_checker


	class AddParticipantOperation(object):
	pass

	class RemoveParticipantOperation(object):
	pass

	class ReferralHandler(object):
	implements(IObserver)

	def __init__(self, session, participant_uri, operation):
	self.participant_uri = participant_uri
	if not isinstance(self.participant_uri, SIPURI):
	if not self.participant_uri.startswith(('sip:', 'sips:')):
	self.participant_uri = 'sip:%s' % self.participant_uri
	try:
	self.participant_uri = SIPURI.parse(self.participant_uri)
	except SIPCoreError:
	notification_center = NotificationCenter()
	if operation is AddParticipantOperation:
	notification_center.post_notification('SIPConferenceDidNotAddParticipant', sender=session, data=NotificationData(participant=self.participant_uri, code=0, reason='invalid participant URI'))
	else:
	notification_center.post_notification('SIPConferenceDidNotRemoveParticipant', sender=session, data=NotificationData(participant=self.participant_uri, code=0, reason='invalid participant URI'))
	return
	self.session = session
	self.operation = operation
	self.active = False
	self.route = None
	self._channel = coros.queue()
	self._referral = None

	def start(self):
	notification_center = NotificationCenter()
	if not self.session.remote_focus:
	if self.operation is AddParticipantOperation:
	notification_center.post_notification('SIPConferenceDidNotAddParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri, code=0, reason='remote endpoint is not a focus'))
	else:
	notification_center.post_notification('SIPConferenceDidNotRemoveParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri, code=0, reason='remote endpoint is not a focus'))
	self.session = None
	return
	notification_center.add_observer(self, sender=self.session)
	notification_center.add_observer(self, name='NetworkConditionsDidChange')
	proc.spawn(self._run)

	def _run(self):
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()

	try:
	# Lookup routes
	account = self.session.account
	if account is BonjourAccount():
	uri = SIPURI.new(self.session._invitation.remote_contact_header.uri)
	elif account.sip.outbound_proxy is not None and account.sip.outbound_proxy.transport in settings.sip.transport_list:
	uri = SIPURI(host=account.sip.outbound_proxy.host, port=account.sip.outbound_proxy.port, parameters={'transport': account.sip.outbound_proxy.transport})
	elif account.sip.always_use_my_proxy:
	uri = SIPURI(host=account.id.domain)
	else:
	uri = SIPURI.new(self.session.remote_identity.uri)
	lookup = DNSLookup()
	try:
	routes = lookup.lookup_sip_proxy(uri, settings.sip.transport_list).wait()
	except DNSLookupError, e:
	timeout = random.uniform(15, 30)
	raise ReferralError(error='DNS lookup failed: %s' % e)

	target_uri = SIPURI.new(self.session.remote_identity.uri)

	timeout = time() + 30
	for route in routes:
	self.route = route
	remaining_time = timeout - time()
	if remaining_time > 0:
	try:
	contact_uri = account.contact[NoGRUU, route]
	except KeyError:
	continue
	refer_to_header = ReferToHeader(str(self.participant_uri))
	refer_to_header.parameters['method'] = 'INVITE' if self.operation is AddParticipantOperation else 'BYE'
	referral = Referral(target_uri, FromHeader(account.uri, account.display_name),
	ToHeader(target_uri),
	refer_to_header,
	ContactHeader(contact_uri),
	RouteHeader(route.uri),
	account.credentials)
	notification_center.add_observer(self, sender=referral)
	try:
	referral.send_refer(timeout=limit(remaining_time, min=1, max=5))
	except SIPCoreError:
	notification_center.remove_observer(self, sender=referral)
	timeout = 5
	raise ReferralError(error='Internal error')
	self._referral = referral
	try:
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPReferralDidStart':
	break
	except SIPReferralDidFail, e:
	notification_center.remove_observer(self, sender=referral)
	self._referral = None
	if e.data.code in (403, 405):
	raise ReferralError(error=sip_status_messages[e.data.code], code=e.data.code)
	else:
	# Otherwise just try the next route
	continue
	else:
	break
	else:
	self.route = None
	raise ReferralError(error='No more routes to try')
	# At this point it is subscribed. Handle notifications and ending/failures.
	try:
	self.active = True
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPReferralGotNotify':
	if notification.data.event == 'refer' and notification.data.body:
	match = sipfrag_re.match(notification.data.body)
	if match:
	code = int(match.group('code'))
	reason = match.group('reason')
	if code/100 > 2:
	continue
	if self.operation is AddParticipantOperation:
	notification_center.post_notification('SIPConferenceGotAddParticipantProgress', sender=self.session, data=NotificationData(participant=self.participant_uri, code=code, reason=reason))
	else:
	notification_center.post_notification('SIPConferenceGotRemoveParticipantProgress', sender=self.session, data=NotificationData(participant=self.participant_uri, code=code, reason=reason))
	elif notification.name == 'SIPReferralDidEnd':
	break
	except SIPReferralDidFail, e:
	notification_center.remove_observer(self, sender=self._referral)
	raise ReferralError(error=e.data.reason, code=e.data.code)
	else:
	notification_center.remove_observer(self, sender=self._referral)
	if self.operation is AddParticipantOperation:
	notification_center.post_notification('SIPConferenceDidAddParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri))
	else:
	notification_center.post_notification('SIPConferenceDidRemoveParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri))
	finally:
	self.active = False
	except TerminateReferral:
	if self._referral is not None:
	try:
	self._referral.end(timeout=2)
	except SIPCoreError:
	pass
	else:
	try:
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPReferralDidEnd':
	break
	except SIPReferralDidFail:
	pass
	finally:
	notification_center.remove_observer(self, sender=self._referral)
	if self.operation is AddParticipantOperation:
	notification_center.post_notification('SIPConferenceDidNotAddParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri, code=0, reason='error'))
	else:
	notification_center.post_notification('SIPConferenceDidNotRemoveParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri, code=0, reason='error'))
	except ReferralError, e:
	if self.operation is AddParticipantOperation:
	notification_center.post_notification('SIPConferenceDidNotAddParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri, code=e.code, reason=e.error))
	else:
	notification_center.post_notification('SIPConferenceDidNotRemoveParticipant', sender=self.session, data=NotificationData(participant=self.participant_uri, code=e.code, reason=e.error))
	finally:
	notification_center.remove_observer(self, sender=self.session)
	notification_center.remove_observer(self, name='NetworkConditionsDidChange')
	self.session = None
	self._referral = None

	def _refresh(self):
	try:
	contact_header = ContactHeader(self.session.account.contact[NoGRUU, self.route])
	except KeyError:
	pass
	else:
	try:
	self._referral.refresh(contact_header=contact_header, timeout=2)
	except (SIPCoreError, SIPCoreInvalidStateError):
	pass

	@run_in_twisted_thread
	def handle_notification(self, notification):
	handler = getattr(self, '_NH_%s' % notification.name, Null)
	handler(notification)

	def _NH_SIPReferralDidStart(self, notification):
	self._channel.send(notification)

	def _NH_SIPReferralDidEnd(self, notification):
	self._channel.send(notification)

	def _NH_SIPReferralDidFail(self, notification):
	self._channel.send_exception(SIPReferralDidFail(notification.data))

	def _NH_SIPReferralGotNotify(self, notification):
	self._channel.send(notification)

	def _NH_SIPSessionDidFail(self, notification):
	self._channel.send_exception(TerminateReferral())

	def _NH_SIPSessionWillEnd(self, notification):
	self._channel.send_exception(TerminateReferral())

	def _NH_NetworkConditionsDidChange(self, notification):
	if self.active:
	self._refresh()


	class ConferenceHandler(object):
	implements(IObserver)

	def __init__(self, session):
	self.session = session
	self.active = False
	self.subscribed = False
	self._command_proc = None
	self._command_channel = coros.queue()
	self._data_channel = coros.queue()
	self._subscription = None
	self._subscription_proc = None
	self._subscription_timer = None
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self.session)
	notification_center.add_observer(self, name='NetworkConditionsDidChange')
	self._command_proc = proc.spawn(self._run)

	@run_in_green_thread
	def add_participant(self, participant_uri):
	referral_handler = ReferralHandler(self.session, participant_uri, AddParticipantOperation)
	referral_handler.start()

	@run_in_green_thread
	def remove_participant(self, participant_uri):
	referral_handler = ReferralHandler(self.session, participant_uri, RemoveParticipantOperation)
	referral_handler.start()

	def _run(self):
	while True:
	command = self._command_channel.wait()
	handler = getattr(self, '_CH_%s' % command.name)
	handler(command)

	def _activate(self):
	self.active = True
	command = Command('subscribe')
	self._command_channel.send(command)
	return command

	def _deactivate(self):
	self.active = False
	command = Command('unsubscribe')
	self._command_channel.send(command)
	return command

	def _resubscribe(self):
	command = Command('subscribe')
	self._command_channel.send(command)
	return command

	def _terminate(self):
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=self.session)
	notification_center.remove_observer(self, name='NetworkConditionsDidChange')
	self._deactivate()
	command = Command('terminate')
	self._command_channel.send(command)
	command.wait()
	self.session = None

	def _CH_subscribe(self, command):
	if self._subscription_timer is not None and self._subscription_timer.active():
	self._subscription_timer.cancel()
	self._subscription_timer = None
	if self._subscription_proc is not None:
	subscription_proc = self._subscription_proc
	subscription_proc.kill(InterruptSubscription)
	subscription_proc.wait()
	self._subscription_proc = proc.spawn(self._subscription_handler, command)

	def _CH_unsubscribe(self, command):
	# Cancel any timer which would restart the subscription process
	if self._subscription_timer is not None and self._subscription_timer.active():
	self._subscription_timer.cancel()
	self._subscription_timer = None
	if self._subscription_proc is not None:
	subscription_proc = self._subscription_proc
	subscription_proc.kill(TerminateSubscription)
	subscription_proc.wait()
	self._subscription_proc = None
	command.signal()

	def _CH_terminate(self, command):
	command.signal()
	raise proc.ProcExit()

	def _subscription_handler(self, command):
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()

	try:
	# Lookup routes
	account = self.session.account
	if account is BonjourAccount():
	uri = SIPURI.new(self.session._invitation.remote_contact_header.uri)
	elif account.sip.outbound_proxy is not None and account.sip.outbound_proxy.transport in settings.sip.transport_list:
	uri = SIPURI(host=account.sip.outbound_proxy.host, port=account.sip.outbound_proxy.port, parameters={'transport': account.sip.outbound_proxy.transport})
	elif account.sip.always_use_my_proxy:
	uri = SIPURI(host=account.id.domain)
	else:
	uri = SIPURI.new(self.session.remote_identity.uri)
	lookup = DNSLookup()
	try:
	routes = lookup.lookup_sip_proxy(uri, settings.sip.transport_list).wait()
	except DNSLookupError, e:
	timeout = random.uniform(15, 30)
	raise SubscriptionError(error='DNS lookup failed: %s' % e, timeout=timeout)

	target_uri = SIPURI.new(self.session.remote_identity.uri)
	default_interval = 600 if account is BonjourAccount() else account.sip.subscribe_interval
	refresh_interval = getattr(command, 'refresh_interval', default_interval)

	timeout = time() + 30
	for route in routes:
	remaining_time = timeout - time()
	if remaining_time > 0:
	try:
	contact_uri = account.contact[NoGRUU, route]
	except KeyError:
	continue
	subscription = Subscription(target_uri, FromHeader(account.uri, account.display_name),
	ToHeader(target_uri),
	ContactHeader(contact_uri),
	'conference',
	RouteHeader(route.uri),
	credentials=account.credentials,
	refresh=refresh_interval)
	notification_center.add_observer(self, sender=subscription)
	try:
	subscription.subscribe(timeout=limit(remaining_time, min=1, max=5))
	except SIPCoreError:
	notification_center.remove_observer(self, sender=subscription)
	timeout = 5
	raise SubscriptionError(error='Internal error', timeout=timeout)
	self._subscription = subscription
	try:
	while True:
	notification = self._data_channel.wait()
	if notification.sender is subscription and notification.name == 'SIPSubscriptionDidStart':
	break
	except SIPSubscriptionDidFail, e:
	notification_center.remove_observer(self, sender=subscription)
	self._subscription = None
	if e.data.code == 407:
	# Authentication failed, so retry the subscription in some time
	timeout = random.uniform(60, 120)
	raise SubscriptionError(error='Authentication failed', timeout=timeout)
	elif e.data.code == 423:
	# Get the value of the Min-Expires header
	timeout = random.uniform(60, 120)
	if e.data.min_expires is not None and e.data.min_expires > refresh_interval:
	raise SubscriptionError(error='Interval too short', timeout=timeout, min_expires=e.data.min_expires)
	else:
	raise SubscriptionError(error='Interval too short', timeout=timeout)
	elif e.data.code in (405, 406, 489, 1400):
	command.signal(e)
	return
	else:
	# Otherwise just try the next route
	continue
	else:
	self.subscribed = True
	command.signal()
	break
	else:
	# There are no more routes to try, reschedule the subscription
	timeout = random.uniform(60, 180)
	raise SubscriptionError(error='No more routes to try', timeout=timeout)
	# At this point it is subscribed. Handle notifications and ending/failures.
	try:
	while True:
	notification = self._data_channel.wait()
	if notification.sender is not self._subscription:
	continue
	if notification.name == 'SIPSubscriptionGotNotify':
	if notification.data.event == 'conference' and notification.data.body:
	try:
	conference_info = ConferenceDocument.parse(notification.data.body)
	except ParserError:
	pass
	else:
	notification_center.post_notification('SIPSessionGotConferenceInfo', sender=self.session, data=NotificationData(conference_info=conference_info))
	elif notification.name == 'SIPSubscriptionDidEnd':
	break
	except SIPSubscriptionDidFail:
	self._command_channel.send(Command('subscribe'))
	notification_center.remove_observer(self, sender=self._subscription)
	except InterruptSubscription, e:
	if not self.subscribed:
	command.signal(e)
	if self._subscription is not None:
	notification_center.remove_observer(self, sender=self._subscription)
	try:
	self._subscription.end(timeout=2)
	except SIPCoreError:
	pass
	except TerminateSubscription, e:
	if not self.subscribed:
	command.signal(e)
	if self._subscription is not None:
	try:
	self._subscription.end(timeout=2)
	except SIPCoreError:
	pass
	else:
	try:
	while True:
	notification = self._data_channel.wait()
	if notification.sender is self._subscription and notification.name == 'SIPSubscriptionDidEnd':
	break
	except SIPSubscriptionDidFail:
	pass
	finally:
	notification_center.remove_observer(self, sender=self._subscription)
	except SubscriptionError, e:
	if 'min_expires' in e.attributes:
	command = Command('subscribe', command.event, refresh_interval=e.attributes['min_expires'])
	else:
	command = Command('subscribe', command.event)
	self._subscription_timer = reactor.callLater(e.timeout, self._command_channel.send, command)
	finally:
	self.subscribed = False
	self._subscription = None
	self._subscription_proc = None

	@run_in_twisted_thread
	def handle_notification(self, notification):
	handler = getattr(self, '_NH_%s' % notification.name, Null)
	handler(notification)

	def _NH_SIPSubscriptionDidStart(self, notification):
	self._data_channel.send(notification)

	def _NH_SIPSubscriptionDidEnd(self, notification):
	self._data_channel.send(notification)

	def _NH_SIPSubscriptionDidFail(self, notification):
	self._data_channel.send_exception(SIPSubscriptionDidFail(notification.data))

	def _NH_SIPSubscriptionGotNotify(self, notification):
	self._data_channel.send(notification)

	def _NH_SIPSessionDidStart(self, notification):
	if self.session.remote_focus:
	self._activate()

	@run_in_green_thread
	def _NH_SIPSessionDidFail(self, notification):
	self._terminate()

	@run_in_green_thread
	def _NH_SIPSessionDidEnd(self, notification):
	self._terminate()

	def _NH_SIPSessionDidRenegotiateStreams(self, notification):
	if self.session.remote_focus and not self.active:
	self._activate()
	elif not self.session.remote_focus and self.active:
	self._deactivate()

	def _NH_NetworkConditionsDidChange(self, notification):
	if self.active:
	self._resubscribe()


	class TransferInfo(object):
	def __init__(self, referred_by=None, replaced_dialog_id=None):
	self.referred_by = referred_by
	self.replaced_dialog_id = replaced_dialog_id

	+
	class TransferHandler(object):
	implements(IObserver)

	def __init__(self, session):
	self.direction = None
	self.new_session = None
	self.session = session
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self.session)
	notification_center.add_observer(self, sender=self.session._invitation)
	self._command_channel = coros.queue()
	self._data_channel = coros.queue()
	self._proc = proc.spawn(self._run)

	def _run(self):
	while True:
	command = self._command_channel.wait()
	handler = getattr(self, '_CH_%s' % command.name)
	handler(command)
	self.direction = None
	self.state = None

	def _CH_incoming_transfer(self, command):
	self.direction = 'incoming'
	notification_center = NotificationCenter()
	refer_to_hdr = command.data.headers.get('Refer-To')
	target = SIPURI.parse(refer_to_hdr.uri)
	referred_by_hdr = command.data.headers.get('Referred-By', None)
	if referred_by_hdr is not None:
	origin = referred_by_hdr.body
	else:
	origin = str(self.session.remote_identity.uri)
	try:
	while True:
	try:
	notification = self._data_channel.wait()
	except SIPInvitationTransferDidFail:
	self.state = 'failed'
	return
	else:
	if notification.name == 'SIPInvitationTransferDidStart':
	self.state = 'starting'
	refer_to_uri = SIPURI.new(target)
	refer_to_uri.headers = {}
	refer_to_uri.parameters = {}
	notification_center.post_notification('SIPSessionTransferNewIncoming', self.session, NotificationData(transfer_destination=refer_to_uri))
	elif notification.name == 'SIPSessionTransferDidStart':
	break
	elif notification.name == 'SIPSessionTransferDidFail':
	self.state = 'failed'
	try:
	self.session._invitation.notify_transfer_progress(notification.data.code, notification.data.reason)
	except SIPCoreError:
	return
	while True:
	try:
	notification = self._data_channel.wait()
	except SIPInvitationTransferDidFail:
	return
	self.state = 'started'
	transfer_info = TransferInfo(referred_by=origin)
	try:
	replaces_hdr = target.headers.pop('Replaces')
	call_id, rest = replaces_hdr.split(';', 1)
	params = dict((item.split('=') for item in rest.split(';')))
	to_tag = params.get('to-tag')
	from_tag = params.get('from-tag')
	except (KeyError, ValueError):
	pass
	else:
	transfer_info.replaced_dialog_id = DialogID(call_id, local_tag=from_tag, remote_tag=to_tag)
	settings = SIPSimpleSettings()
	account = self.session.account
	if account is BonjourAccount():
	uri = target
	elif account.sip.outbound_proxy is not None and account.sip.outbound_proxy.transport in settings.sip.transport_list:
	uri = SIPURI(host=account.sip.outbound_proxy.host, port=account.sip.outbound_proxy.port, parameters={'transport': account.sip.outbound_proxy.transport})
	elif account.sip.always_use_my_proxy:
	uri = SIPURI(host=account.id.domain)
	else:
	uri = target
	lookup = DNSLookup()
	try:
	routes = lookup.lookup_sip_proxy(uri, settings.sip.transport_list).wait()
	except DNSLookupError, e:
	self.state = 'failed'
	notification_center.post_notification('SIPSessionTransferDidFail', sender=self.session, data=NotificationData(code=0, reason="DNS lookup failed: {}".format(e)))
	try:
	self.session._invitation.notify_transfer_progress(480)
	except SIPCoreError:
	return
	while True:
	try:
	self._data_channel.wait()
	except SIPInvitationTransferDidFail:
	return
	return
	self.new_session = Session(account)
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self.new_session)
	self.new_session.connect(ToHeader(target), routes=routes, streams=[MediaStreamRegistry.AudioStream()], transfer_info=transfer_info)
	while True:
	try:
	notification = self._data_channel.wait()
	except SIPInvitationTransferDidFail:
	return
	if notification.name == 'SIPInvitationTransferDidEnd':
	return
	except proc.ProcExit:
	if self.new_session is not None:
	notification_center.remove_observer(self, sender=self.new_session)
	self.new_session = None
	raise

	def _CH_outgoing_transfer(self, command):
	self.direction = 'outgoing'
	notification_center = NotificationCenter()
	self.state = 'starting'
	while True:
	try:
	notification = self._data_channel.wait()
	except SIPInvitationTransferDidFail, e:
	self.state = 'failed'
	notification_center.post_notification('SIPSessionTransferDidFail', sender=self.session, data=NotificationData(code=e.data.code, reason=e.data.reason))
	return
	if notification.name == 'SIPInvitationTransferDidStart':
	self.state = 'started'
	notification_center.post_notification('SIPSessionTransferDidStart', sender=self.session)
	elif notification.name == 'SIPInvitationTransferDidEnd':
	self.state = 'ended'
	self.session.end()
	notification_center.post_notification('SIPSessionTransferDidEnd', sender=self.session)
	return

	def _terminate(self):
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=self.session._invitation)
	notification_center.remove_observer(self, sender=self.session)
	self._proc.kill()
	self._proc = None
	self._command_channel = None
	self._data_channel = None
	self.session = None

	@run_in_twisted_thread
	def handle_notification(self, notification):
	handler = getattr(self, '_NH_%s' % notification.name, Null)
	handler(notification)

	def _NH_SIPInvitationTransferNewIncoming(self, notification):
	self._command_channel.send(Command('incoming_transfer', data=notification.data))

	def _NH_SIPInvitationTransferNewOutgoing(self, notification):
	self._command_channel.send(Command('outgoing_transfer', data=notification.data))

	def _NH_SIPInvitationTransferDidStart(self, notification):
	self._data_channel.send(notification)

	def _NH_SIPInvitationTransferDidFail(self, notification):
	self._data_channel.send_exception(SIPInvitationTransferDidFail(notification.data))

	def _NH_SIPInvitationTransferDidEnd(self, notification):
	self._data_channel.send(notification)

	def _NH_SIPInvitationTransferGotNotify(self, notification):
	if notification.data.event == 'refer' and notification.data.body:
	match = sipfrag_re.match(notification.data.body)
	if match:
	code = int(match.group('code'))
	reason = match.group('reason')
	notification.center.post_notification('SIPSessionTransferGotProgress', sender=self.session, data=NotificationData(code=code, reason=reason))

	def _NH_SIPSessionTransferDidStart(self, notification):
	if notification.sender is self.session and self.state == 'starting':
	self._data_channel.send(notification)

	def _NH_SIPSessionTransferDidFail(self, notification):
	if notification.sender is self.session and self.state == 'starting':
	self._data_channel.send(notification)

	def _NH_SIPSessionGotRingIndication(self, notification):
	if notification.sender is self.new_session and self.session is not None:
	try:
	self.session._invitation.notify_transfer_progress(180)
	except SIPCoreError:
	pass

	def _NH_SIPSessionGotProvisionalResponse(self, notification):
	if notification.sender is self.new_session and self.session is not None:
	try:
	self.session._invitation.notify_transfer_progress(notification.data.code, notification.data.reason)
	except SIPCoreError:
	pass

	def _NH_SIPSessionDidStart(self, notification):
	if notification.sender is self.new_session:
	notification.center.remove_observer(self, sender=notification.sender)
	self.new_session = None
	if self.session is not None:
	notification.center.post_notification('SIPSessionTransferDidEnd', sender=self.session)
	if self.state == 'started':
	try:
	self.session._invitation.notify_transfer_progress(200)
	except SIPCoreError:
	pass
	self.state = 'ended'
	self.session.end()

	def _NH_SIPSessionDidEnd(self, notification):
	if notification.sender is self.new_session:
	# If any stream fails to start we won't get SIPSessionDidFail, we'll get here instead
	notification.center.remove_observer(self, sender=notification.sender)
	self.new_session = None
	if self.session is not None:
	notification.center.post_notification('SIPSessionTransferDidFail', sender=self.session, data=NotificationData(code=500, reason='internal error'))
	if self.state == 'started':
	try:
	self.session._invitation.notify_transfer_progress(500)
	except SIPCoreError:
	pass
	self.state = 'failed'
	else:
	self._terminate()

	def _NH_SIPSessionDidFail(self, notification):
	if notification.sender is self.new_session:
	notification.center.remove_observer(self, sender=notification.sender)
	self.new_session = None
	if self.session is not None:
	notification.center.post_notification('SIPSessionTransferDidFail', sender=self.session, data=NotificationData(code=notification.data.code or 500, reason=notification.data.reason))
	if self.state == 'started':
	try:
	self.session._invitation.notify_transfer_progress(notification.data.code or 500, notification.data.reason)
	except SIPCoreError:
	pass
	self.state = 'failed'
	else:
	self._terminate()


	class SessionReplaceHandler(object):
	implements(IObserver)

	def __init__(self, session):
	self.session = session

	def start(self):
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self.session)
	notification_center.add_observer(self, sender=self.session.replaced_session)

	def handle_notification(self, notification):
	handler = getattr(self, '_NH_%s' % notification.name, Null)
	handler(notification)

	def _NH_SIPSessionDidStart(self, notification):
	notification.center.remove_observer(self, sender=self.session)
	notification.center.remove_observer(self, sender=self.session.replaced_session)
	self.session.replaced_session.end()
	self.session.replaced_session = None
	self.session = None

	def _NH_SIPSessionDidFail(self, notification):
	if notification.sender is self.session:
	notification.center.remove_observer(self, sender=self.session)
	notification.center.remove_observer(self, sender=self.session.replaced_session)
	self.session.replaced_session = None
	self.session = None

	_NH_SIPSessionDidEnd = _NH_SIPSessionDidFail


	class Session(object):
	implements(IObserver)

	media_stream_timeout = 15
	short_reinvite_timeout = 5

	def __init__(self, account):
	self.account = account
	self.direction = None
	self.end_time = None
	self.on_hold = False
	self.proposed_streams = None
	self.route = None
	self.state = None
	self.start_time = None
	self.streams = None
	self.transport = None
	self.local_focus = False
	self.remote_focus = False
	self.greenlet = None
	self.conference = None
	self.replaced_session = None
	self.transfer_handler = None
	self.transfer_info = None
	self._channel = coros.queue()
	self._hold_in_progress = False
	self._invitation = None
	self._local_identity = None
	self._remote_identity = None
	self._lock = RLock()

	def init_incoming(self, invitation, data):
	notification_center = NotificationCenter()
	remote_sdp = invitation.sdp.proposed_remote
	self.proposed_streams = []
	if remote_sdp:
	for index, media_stream in enumerate(remote_sdp.media):
	if media_stream.port != 0:
	for stream_type in MediaStreamRegistry:
	try:
	stream = stream_type.new_from_sdp(self, remote_sdp, index)
	except UnknownStreamError:
	continue
	except InvalidStreamError as e:
	log.error("Invalid stream: {}".format(e))
	break
	except Exception as e:
	log.error("Exception occurred while setting up stream from SDP: {}".format(e))
	log.err()
	break
	else:
	stream.index = index
	self.proposed_streams.append(stream)
	break
	self.direction = 'incoming'
	self.state = 'incoming'
	self.transport = invitation.transport
	self._invitation = invitation
	self.conference = ConferenceHandler(self)
	self.transfer_handler = TransferHandler(self)
	if 'isfocus' in invitation.remote_contact_header.parameters:
	self.remote_focus = True
	if 'Referred-By' in data.headers or 'Replaces' in data.headers:
	self.transfer_info = TransferInfo()
	if 'Referred-By' in data.headers:
	self.transfer_info.referred_by = data.headers['Referred-By'].body
	if 'Replaces' in data.headers:
	replaces_header = data.headers.get('Replaces')
	replaced_dialog_id = DialogID(replaces_header.call_id, local_tag=replaces_header.to_tag, remote_tag=replaces_header.from_tag)
	session_manager = SessionManager()
	try:
	self.replaced_session = (session for session in session_manager.sessions if session._invitation is not None and session._invitation.dialog_id == replaced_dialog_id).next()
	except StopIteration:
	invitation.send_response(481)
	return
	else:
	self.transfer_info.replaced_dialog_id = replaced_dialog_id
	replace_handler = SessionReplaceHandler(self)
	replace_handler.start()
	notification_center.add_observer(self, sender=invitation)
	notification_center.post_notification('SIPSessionNewIncoming', sender=self, data=NotificationData(streams=self.proposed_streams[:], headers=data.headers))

	@transition_state(None, 'connecting')
	@run_in_green_thread
	def connect(self, to_header, routes, streams, is_focus=False, transfer_info=None, extra_headers=None):
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()

	connected = False
	received_code = 0
	received_reason = None
	unhandled_notifications = []
	extra_headers = extra_headers or []

	if {'to', 'from', 'via', 'contact', 'route', 'record-route'}.intersection(header.name.lower() for header in extra_headers):
	raise RuntimeError('invalid header in extra_headers: To, From, Via, Contact, Route and Record-Route headers are not allowed')

	self.direction = 'outgoing'
	self.proposed_streams = streams
	self.route = routes[0]
	self.transport = self.route.transport
	self.local_focus = is_focus
	self._invitation = Invitation()
	self._local_identity = FromHeader(self.account.uri, self.account.display_name)
	self._remote_identity = to_header
	self.conference = ConferenceHandler(self)
	self.transfer_handler = TransferHandler(self)
	self.transfer_info = transfer_info
	notification_center.add_observer(self, sender=self._invitation)
	notification_center.post_notification('SIPSessionNewOutgoing', sender=self, data=NotificationData(streams=streams[:]))
	for stream in self.proposed_streams:
	notification_center.add_observer(self, sender=stream)
	stream.initialize(self, direction='outgoing')

	try:
	wait_count = len(self.proposed_streams)
	while wait_count > 0:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidInitialize':
	wait_count -= 1
	try:
	contact_uri = self.account.contact[PublicGRUUIfAvailable, self.route]
	local_ip = host.outgoing_ip_for(self.route.address)
	if local_ip is None:
	raise ValueError("could not get outgoing IP address")
	except (KeyError, ValueError), e:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self._fail(originator='local', code=480, reason=sip_status_messages[480], error=str(e))
	return
	connection = SDPConnection(local_ip)
	local_sdp = SDPSession(local_ip, name=settings.user_agent)
	for index, stream in enumerate(self.proposed_streams):
	stream.index = index
	media = stream.get_local_media(remote_sdp=None, index=index)
	if media.connection is None or (media.connection is not None and not media.has_ice_attributes and not media.has_ice_candidates):
	media.connection = connection
	local_sdp.media.append(media)
	from_header = FromHeader(self.account.uri, self.account.display_name)
	route_header = RouteHeader(self.route.uri)
	contact_header = ContactHeader(contact_uri)
	if is_focus:
	contact_header.parameters['isfocus'] = None
	if self.transfer_info is not None:
	if self.transfer_info.referred_by is not None:
	extra_headers.append(Header('Referred-By', self.transfer_info.referred_by))
	if self.transfer_info.replaced_dialog_id is not None:
	dialog_id = self.transfer_info.replaced_dialog_id
	extra_headers.append(ReplacesHeader(dialog_id.call_id, dialog_id.local_tag, dialog_id.remote_tag))
	self._invitation.send_invite(to_header.uri, from_header, to_header, route_header, contact_header, local_sdp, self.account.credentials, extra_headers)
	try:
	with api.timeout(settings.sip.invite_timeout):
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	break
	else:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self._fail(originator='remote', code=0, reason=None, error='SDP negotiation failed: %s' % notification.data.error)
	return
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'early':
	if notification.data.code == 180:
	notification_center.post_notification('SIPSessionGotRingIndication', self)
	notification_center.post_notification('SIPSessionGotProvisionalResponse', self, NotificationData(code=notification.data.code, reason=notification.data.reason))
	elif notification.data.state == 'connecting':
	received_code = notification.data.code
	received_reason = notification.data.reason
	elif notification.data.state == 'connected':
	if not connected:
	connected = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='local', method='INVITE', code=received_code, reason=received_reason))
	else:
	unhandled_notifications.append(notification)
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	except api.TimeoutError:
	self.end()
	return

	notification_center.post_notification('SIPSessionWillStart', sender=self)
	stream_map = dict((stream.index, stream) for stream in self.proposed_streams)
	for index, local_media in enumerate(local_sdp.media):
	remote_media = remote_sdp.media[index]
	stream = stream_map[index]
	if remote_media.port:
	# TODO: check if port is also 0 in local_sdp. In that case PJSIP disabled the stream because
	# negotiation failed. If there are more streams, however, the negotiation is considered successful as a
	# whole, so while we built a normal SDP, PJSIP modified it and sent it to the other side. That's kind io
	# OK, but we cannot really start the stream. -Saul
	stream.start(local_sdp, remote_sdp, index)
	else:
	notification_center.remove_observer(self, sender=stream)
	self.proposed_streams.remove(stream)
	del stream_map[stream.index]
	stream.deactivate()
	stream.end()
	removed_streams = [stream for stream in self.proposed_streams if stream.index >= len(local_sdp.media)]
	for stream in removed_streams:
	notification_center.remove_observer(self, sender=stream)
	self.proposed_streams.remove(stream)
	del stream_map[stream.index]
	stream.deactivate()
	stream.end()
	invitation_notifications = []
	with api.timeout(self.media_stream_timeout):
	wait_count = len(self.proposed_streams)
	while wait_count > 0:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidStart':
	wait_count -= 1
	elif notification.name == 'SIPInvitationChangedState':
	invitation_notifications.append(notification)
	for notification in invitation_notifications:
	self._channel.send(notification)
	while not connected or self._channel:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'early':
	if notification.data.code == 180:
	notification_center.post_notification('SIPSessionGotRingIndication', self)
	notification_center.post_notification('SIPSessionGotProvisionalResponse', self, NotificationData(code=notification.data.code, reason=notification.data.reason))
	elif notification.data.state == 'connecting':
	received_code = notification.data.code
	received_reason = notification.data.reason
	elif notification.data.state == 'connected':
	if not connected:
	connected = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=received_code, reason=received_reason))
	else:
	unhandled_notifications.append(notification)
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	except (MediaStreamDidNotInitializeError, MediaStreamDidFailError, api.TimeoutError), e:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	if isinstance(e, api.TimeoutError):
	error = 'media stream timed-out while starting'
	elif isinstance(e, MediaStreamDidNotInitializeError):
	error = 'media stream did not initialize: %s' % e.data.reason
	else:
	error = 'media stream failed: %s' % e.data.reason
	self._fail(originator='local', code=0, reason=None, error=error)
	except InvitationDisconnectedError, e:
	notification_center.remove_observer(self, sender=self._invitation)
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self.state = 'terminated'
	# As weird as it may sound, PJSIP accepts a BYE even without receiving a final response to the INVITE
	if e.data.prev_state in ('connecting', 'connected') or getattr(e.data, 'method', None) == 'BYE':
	notification_center.post_notification('SIPSessionWillEnd', self, NotificationData(originator=e.data.originator))
	if e.data.originator == 'remote':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method=e.data.method, code=200, reason=sip_status_messages[200]))
	self.end_time = ISOTimestamp.now()
	notification_center.post_notification('SIPSessionDidEnd', self, NotificationData(originator=e.data.originator, end_reason=e.data.disconnect_reason))
	else:
	if e.data.originator == 'remote':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=e.data.code, reason=e.data.reason))
	code = e.data.code
	reason = e.data.reason
	elif e.data.disconnect_reason == 'timeout':
	code = 408
	reason = 'timeout'
	else:
	#TODO: we should know exactly when there are set -Saul
	code = getattr(e.data, 'code', 0)
	reason = getattr(e.data, 'reason', 'Session disconnected')
	if e.data.originator == 'remote' and code // 100 == 3:
	redirect_identities = e.data.headers.get('Contact', [])
	else:
	redirect_identities = None
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator=e.data.originator, code=code, reason=reason, failure_reason=e.data.disconnect_reason, redirect_identities=redirect_identities))
	self.greenlet = None
	except SIPCoreError, e:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self._fail(originator='local', code=0, reason=None, error='SIP core error: %s' % str(e))
	else:
	self.greenlet = None
	self.state = 'connected'
	self.streams = self.proposed_streams
	self.proposed_streams = None
	self.start_time = ISOTimestamp.now()
	any_stream_ice = any(getattr(stream, 'ice_active', False) for stream in self.streams)
	if any_stream_ice:
	self._reinvite_after_ice()
	notification_center.post_notification('SIPSessionDidStart', self, NotificationData(streams=self.streams[:]))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	self._send_hold()

	def _reinvite_after_ice(self):
	# This function does not do any error checking, it's designed to be called at the end of connect and add_stream
	self.state = 'sending_proposal'
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()

	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	for index, stream in enumerate(self.streams):
	local_sdp.media[index] = stream.get_local_media(remote_sdp=None, index=index)
	self._invitation.send_reinvite(sdp=local_sdp)

	received_invitation_state = False
	received_sdp_update = False
	try:
	with api.timeout(self.short_reinvite_timeout):
	while not received_invitation_state or not received_sdp_update:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for index, stream in enumerate(self.streams):
	stream.update(local_sdp, remote_sdp, index)
	else:
	return
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	elif notification.data.state == 'disconnected':
	self.end()
	return
	except Exception:
	pass
	finally:
	self.state = 'connected'
	self.greenlet = None

	@check_state(['incoming', 'received_proposal'])
	@run_in_green_thread
	def send_ring_indication(self):
	try:
	self._invitation.send_response(180)
	except SIPCoreInvalidStateError:
	pass # The INVITE session might have already been cancelled; ignore the error

	@transition_state('incoming', 'accepting')
	@run_in_green_thread
	def accept(self, streams, is_focus=False, extra_headers=None):
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()

	self.local_focus = is_focus
	connected = False
	unhandled_notifications = []
	extra_headers = extra_headers or []

	if {'to', 'from', 'via', 'contact', 'route', 'record-route'}.intersection(header.name.lower() for header in extra_headers):
	raise RuntimeError('invalid header in extra_headers: To, From, Via, Contact, Route and Record-Route headers are not allowed')

	if self.proposed_streams:
	for stream in self.proposed_streams:
	if stream in streams:
	notification_center.add_observer(self, sender=stream)
	stream.initialize(self, direction='incoming')
	else:
	for index, stream in enumerate(streams):
	notification_center.add_observer(self, sender=stream)
	stream.index = index
	stream.initialize(self, direction='outgoing')
	self.proposed_streams = streams

	wait_count = len(self.proposed_streams)

	try:
	while wait_count > 0:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidInitialize':
	wait_count -= 1

	remote_sdp = self._invitation.sdp.proposed_remote
	sdp_connection = remote_sdp.connection or (media.connection for media in remote_sdp.media if media.connection is not None).next()
	local_ip = host.outgoing_ip_for(sdp_connection.address) if sdp_connection.address != '0.0.0.0' else sdp_connection.address
	if local_ip is None:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self._fail(originator='local', code=500, reason=sip_status_messages[500], error='could not get local IP address')
	return
	connection = SDPConnection(local_ip)
	local_sdp = SDPSession(local_ip, name=settings.user_agent)
	if remote_sdp:
	stream_map = dict((stream.index, stream) for stream in self.proposed_streams)
	for index, media in enumerate(remote_sdp.media):
	stream = stream_map.get(index, None)
	if stream is not None:
	media = stream.get_local_media(remote_sdp=remote_sdp, index=index)
	if not media.has_ice_attributes and not media.has_ice_candidates:
	media.connection = connection
	else:
	media = SDPMediaStream.new(media)
	media.connection = connection
	media.port = 0
	media.attributes = []
	media.bandwidth_info = []
	local_sdp.media.append(media)
	else:
	for index, stream in enumerate(self.proposed_streams):
	stream.index = index
	media = stream.get_local_media(remote_sdp=None, index=index)
	if media.connection is None or (media.connection is not None and not media.has_ice_attributes and not media.has_ice_candidates):
	media.connection = connection
	local_sdp.media.append(media)
	contact_header = ContactHeader.new(self._invitation.local_contact_header)
	try:
	local_contact_uri = self.account.contact[PublicGRUU, self._invitation.transport]
	except KeyError:
	pass
	else:
	contact_header.uri = local_contact_uri
	if is_focus:
	contact_header.parameters['isfocus'] = None
	self._invitation.send_response(200, contact_header=contact_header, sdp=local_sdp, extra_headers=extra_headers)
	notification_center.post_notification('SIPSessionWillStart', sender=self)
	# Local and remote SDPs will be set after the 200 OK is sent
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	break
	else:
	if not connected:
	# we could not have got a SIPInvitationGotSDPUpdate if we did not get an ACK
	connected = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='remote', method='INVITE', code=200, reason=sip_status_messages[200], ack_received=True))
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self._fail(originator='remote', code=0, reason=None, error='SDP negotiation failed: %s' % notification.data.error)
	return
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected':
	if not connected:
	connected = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason=sip_status_messages[200], ack_received=True))
	elif notification.data.prev_state == 'connected':
	unhandled_notifications.append(notification)
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	wait_count = 0
	stream_map = dict((stream.index, stream) for stream in self.proposed_streams)
	for index, local_media in enumerate(local_sdp.media):
	remote_media = remote_sdp.media[index]
	stream = stream_map.get(index, None)
	if stream is not None:
	if remote_media.port:
	wait_count += 1
	stream.start(local_sdp, remote_sdp, index)
	else:
	notification_center.remove_observer(self, sender=stream)
	self.proposed_streams.remove(stream)
	del stream_map[stream.index]
	stream.deactivate()
	stream.end()
	removed_streams = [stream for stream in self.proposed_streams if stream.index >= len(local_sdp.media)]
	for stream in removed_streams:
	notification_center.remove_observer(self, sender=stream)
	self.proposed_streams.remove(stream)
	del stream_map[stream.index]
	stream.deactivate()
	stream.end()
	with api.timeout(self.media_stream_timeout):
	while wait_count > 0 or not connected or self._channel:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidStart':
	wait_count -= 1
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected':
	if not connected:
	connected = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason='OK', ack_received=True))
	elif notification.data.prev_state == 'connected':
	unhandled_notifications.append(notification)
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	else:
	unhandled_notifications.append(notification)
	except (MediaStreamDidNotInitializeError, MediaStreamDidFailError, api.TimeoutError), e:
	if self._invitation.state == 'connecting':
	ack_received = False if isinstance(e, api.TimeoutError) and wait_count == 0 else 'unknown'
	# pjsip's invite session object does not inform us whether the ACK was received or not
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason='OK', ack_received=ack_received))
	elif self._invitation.state == 'connected' and not connected:
	# we didn't yet get to process the SIPInvitationChangedState (state -> connected) notification
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason='OK', ack_received=True))
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	reason_header = None
	if isinstance(e, api.TimeoutError):
	if wait_count > 0:
	error = 'media stream timed-out while starting'
	else:
	error = 'No ACK received'
	reason_header = ReasonHeader('SIP')
	reason_header.cause = 500
	reason_header.text = 'Missing ACK'
	elif isinstance(e, MediaStreamDidNotInitializeError):
	error = 'media stream did not initialize: %s' % e.data.reason
	reason_header = ReasonHeader('SIP')
	reason_header.cause = 500
	reason_header.text = 'media stream did not initialize'
	else:
	error = 'media stream failed: %s' % e.data.reason
	reason_header = ReasonHeader('SIP')
	reason_header.cause = 500
	reason_header.text = 'media stream failed to start'
	self.start_time = ISOTimestamp.now()
	if self._invitation.state in ('incoming', 'early'):
	self._fail(originator='local', code=500, reason=sip_status_messages[500], error=error, reason_header=reason_header)
	else:
	self._fail(originator='local', code=0, reason=None, error=error, reason_header=reason_header)
	except InvitationDisconnectedError, e:
	notification_center.remove_observer(self, sender=self._invitation)
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self.state = 'terminated'
	if e.data.prev_state in ('incoming', 'early'):
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=487, reason='Session Cancelled', ack_received='unknown'))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='remote', code=487, reason='Session Cancelled', failure_reason=e.data.disconnect_reason, redirect_identities=None))
	elif e.data.prev_state == 'connecting' and e.data.disconnect_reason == 'missing ACK':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason='OK', ack_received=False))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=200, reason=sip_status_messages[200], failure_reason=e.data.disconnect_reason, redirect_identities=None))
	else:
	notification_center.post_notification('SIPSessionWillEnd', self, NotificationData(originator='remote'))
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method=getattr(e.data, 'method', 'INVITE'), code=200, reason='OK'))
	self.end_time = ISOTimestamp.now()
	notification_center.post_notification('SIPSessionDidEnd', self, NotificationData(originator='remote', end_reason=e.data.disconnect_reason))
	self.greenlet = None
	except SIPCoreInvalidStateError:
	# the only reason for which this error can be thrown is if invitation.send_response was called after the INVITE session was cancelled by the remote party
	notification_center.remove_observer(self, sender=self._invitation)
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self.greenlet = None
	self.state = 'terminated'
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=487, reason='Session Cancelled', ack_received='unknown'))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='remote', code=487, reason='Session Cancelled', failure_reason='user request', redirect_identities=None))
	except SIPCoreError, e:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self._fail(originator='local', code=500, reason=sip_status_messages[500], error='SIP core error: %s' % str(e))
	else:
	self.greenlet = None
	self.state = 'connected'
	self.streams = self.proposed_streams
	self.proposed_streams = None
	self.start_time = ISOTimestamp.now()
	notification_center.post_notification('SIPSessionDidStart', self, NotificationData(streams=self.streams[:]))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	self._send_hold()

	@transition_state('incoming', 'terminating')
	@run_in_green_thread
	def reject(self, code=603, reason=None):
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()

	try:
	self._invitation.send_response(code, reason)
	with api.timeout(1):
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'disconnected':
	ack_received = notification.data.disconnect_reason != 'missing ACK'
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='remote', method='INVITE', code=code, reason=sip_status_messages[code], ack_received=ack_received))
	break
	except SIPCoreInvalidStateError:
	# the only reason for which this error can be thrown is if invitation.send_response was called after the INVITE session was cancelled by the remote party
	notification_center.remove_observer(self, sender=self._invitation)
	self.greenlet = None
	self.state = 'terminated'
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=487, reason='Session Cancelled', ack_received='unknown'))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='remote', code=487, reason='Session Cancelled', failure_reason='user request', redirect_identities=None))
	except SIPCoreError, e:
	self._fail(originator='local', code=500, reason=sip_status_messages[500], error='SIP core error: %s' % str(e))
	except api.TimeoutError:
	notification_center.remove_observer(self, sender=self._invitation)
	self.greenlet = None
	self.state = 'terminated'
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=code, reason=sip_status_messages[code], ack_received=False))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=code, reason=sip_status_messages[code], failure_reason='timeout', redirect_identities=None))
	else:
	notification_center.remove_observer(self, sender=self._invitation)
	self.greenlet = None
	self.state = 'terminated'
	self.proposed_streams = None
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=code, reason=sip_status_messages[code], failure_reason='user request', redirect_identities=None))

	@transition_state('received_proposal', 'accepting_proposal')
	@run_in_green_thread
	def accept_proposal(self, streams):
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()

	unhandled_notifications = []

	streams = [stream for stream in streams if stream in self.proposed_streams]
	for stream in streams:
	notification_center.add_observer(self, sender=stream)
	stream.initialize(self, direction='incoming')

	try:
	wait_count = len(streams)
	while wait_count > 0:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidInitialize':
	wait_count -= 1

	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	remote_sdp = self._invitation.sdp.proposed_remote
	connection = SDPConnection(local_sdp.address)
	stream_map = dict((stream.index, stream) for stream in streams)
	for index, media in enumerate(remote_sdp.media):
	stream = stream_map.get(index, None)
	if stream is not None:
	media = stream.get_local_media(remote_sdp=remote_sdp, index=index)
	if not media.has_ice_attributes and not media.has_ice_candidates:
	media.connection = connection
	if index < len(local_sdp.media):
	local_sdp.media[index] = media
	else:
	local_sdp.media.append(media)
	elif index >= len(local_sdp.media): # actually == is sufficient
	media = SDPMediaStream.new(media)
	media.connection = connection
	media.port = 0
	media.attributes = []
	media.bandwidth_info = []
	local_sdp.media.append(media)
	self._invitation.send_response(200, sdp=local_sdp)

	prev_on_hold_streams = set(stream for stream in self.streams if stream.hold_supported and stream.on_hold_by_remote)

	received_invitation_state = False
	received_sdp_update = False
	while not received_invitation_state or not received_sdp_update:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for stream in self.streams:
	stream.update(local_sdp, remote_sdp, stream.index)
	else:
	self._fail_proposal(originator='remote', error='SDP negotiation failed: %s' % notification.data.error)
	return
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason=sip_status_messages[200], ack_received='unknown'))
	received_invitation_state = True
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)

	on_hold_streams = set(stream for stream in self.streams if stream.hold_supported and stream.on_hold_by_remote)
	if on_hold_streams != prev_on_hold_streams:
	hold_supported_streams = (stream for stream in self.streams if stream.hold_supported)
	notification_center.post_notification('SIPSessionDidChangeHoldState', self, NotificationData(originator='remote', on_hold=bool(on_hold_streams),
	partial=bool(on_hold_streams) and any(not stream.on_hold_by_remote for stream in hold_supported_streams)))

	for stream in streams:
	# TODO: check if port is 0 in local_sdp. In that case PJSIP disabled the stream because
	# negotiation failed. If there are more streams, however, the negotiation is considered successful as a
	# whole, so while we built a normal SDP, PJSIP modified it and sent it to the other side. That's kind of
	# OK, but we cannot really start the stream. -Saul
	stream.start(local_sdp, remote_sdp, stream.index)
	with api.timeout(self.media_stream_timeout):
	wait_count = len(streams)
	while wait_count > 0 or self._channel:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidStart':
	wait_count -= 1
	else:
	unhandled_notifications.append(notification)
	except api.TimeoutError:
	self._fail_proposal(originator='remote', error='media stream timed-out while starting')
	except MediaStreamDidNotInitializeError as e:
	self._fail_proposal(originator='remote', error='media stream did not initialize: {.data.reason}'.format(e))
	except MediaStreamDidFailError as e:
	self._fail_proposal(originator='remote', error='media stream failed: {.data.reason}'.format(e))
	except InvitationDisconnectedError, e:
	self._fail_proposal(originator='remote', error='session ended')
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	except SIPCoreError, e:
	self._fail_proposal(originator='remote', error='SIP core error: %s' % str(e))
	else:
	self.greenlet = None
	self.state = 'connected'
	self.streams = self.streams + streams
	proposed_streams = self.proposed_streams[:]
	self.proposed_streams = None
	notification_center.post_notification('SIPSessionProposalAccepted', self, NotificationData(originator='remote', accepted_streams=streams, proposed_streams=proposed_streams))
	notification_center.post_notification('SIPSessionDidRenegotiateStreams', self, NotificationData(originator='remote', added_streams=streams, removed_streams=[]))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	self._send_hold()

	@transition_state('received_proposal', 'rejecting_proposal')
	@run_in_green_thread
	def reject_proposal(self, code=488, reason=None):
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()

	try:
	self._invitation.send_response(code, reason)
	with api.timeout(1, None):
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=code, reason=sip_status_messages[code], ack_received='unknown'))
	break
	except SIPCoreError, e:
	self._fail_proposal(originator='remote', error='SIP core error: %s' % str(e))
	else:
	self.greenlet = None
	self.state = 'connected'
	proposed_streams = self.proposed_streams[:]
	self.proposed_streams = None
	notification_center.post_notification('SIPSessionProposalRejected', self, NotificationData(originator='remote', code=code, reason=sip_status_messages[code], proposed_streams=proposed_streams))
	if self._hold_in_progress:
	self._send_hold()

	def add_stream(self, stream):
	self.add_streams([stream])

	@transition_state('connected', 'sending_proposal')
	@run_in_green_thread
	def add_streams(self, streams):
	streams = list(set(streams).difference(self.streams))
	if not streams:
	self.state = 'connected'
	return

	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()
	unhandled_notifications = []

	self.proposed_streams = streams
	for stream in self.proposed_streams:
	notification_center.add_observer(self, sender=stream)
	stream.initialize(self, direction='outgoing')

	try:
	wait_count = len(self.proposed_streams)
	while wait_count > 0:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidInitialize':
	wait_count -= 1
	elif notification.name == 'SIPInvitationChangedState':
	# This is actually the only reason for which this notification could be received
	if notification.data.state == 'connected' and notification.data.sub_state == 'received_proposal':
	self._fail_proposal(originator='local', error='received stream proposal')
	self.handle_notification(notification)
	return

	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	for stream in self.proposed_streams:
	# Try to reuse a disabled media stream to avoid an ever-growing SDP
	try:
	index = next(index for index, media in enumerate(local_sdp.media) if media.port == 0)
	reuse_media = True
	except StopIteration:
	index = len(local_sdp.media)
	reuse_media = False
	stream.index = index
	media = stream.get_local_media(remote_sdp=None, index=index)
	if reuse_media:
	local_sdp.media[index] = media
	else:
	local_sdp.media.append(media)
	self._invitation.send_reinvite(sdp=local_sdp)
	notification_center.post_notification('SIPSessionNewProposal', sender=self, data=NotificationData(originator='local', proposed_streams=self.proposed_streams[:]))

	received_invitation_state = False
	received_sdp_update = False
	try:
	with api.timeout(settings.sip.invite_timeout):
	while not received_invitation_state or not received_sdp_update:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for s in self.streams:
	s.update(local_sdp, remote_sdp, s.index)
	else:
	self._fail_proposal(originator='local', error='SDP negotiation failed: %s' % notification.data.error)
	return
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	if notification.data.code >= 300:
	for stream in self.proposed_streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self.greenlet = None
	self.state = 'connected'
	proposed_streams = self.proposed_streams[:]
	self.proposed_streams = None
	notification_center.post_notification('SIPSessionProposalRejected', self, NotificationData(originator='local', code=notification.data.code, reason=notification.data.reason, proposed_streams=proposed_streams))
	return
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	except api.TimeoutError:
	self.cancel_proposal()
	return

	accepted_streams = []
	for stream in self.proposed_streams:
	try:
	remote_media = remote_sdp.media[stream.index]
	except IndexError:
	self._fail_proposal(originator='local', error='SDP media missing in answer')
	return
	else:
	if remote_media.port:
	stream.start(local_sdp, remote_sdp, stream.index)
	accepted_streams.append(stream)
	else:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()

	with api.timeout(self.media_stream_timeout):
	wait_count = len(accepted_streams)
	while wait_count > 0:
	notification = self._channel.wait()
	if notification.name == 'MediaStreamDidStart':
	wait_count -= 1
	except api.TimeoutError:
	self._fail_proposal(originator='local', error='media stream timed-out while starting')
	except MediaStreamDidNotInitializeError as e:
	self._fail_proposal(originator='local', error='media stream did not initialize: {.data.reason}'.format(e))
	except MediaStreamDidFailError as e:
	self._fail_proposal(originator='local', error='media stream failed: {.data.reason}'.format(e))
	except InvitationDisconnectedError, e:
	self._fail_proposal(originator='local', error='session ended')
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	except SIPCoreError, e:
	self._fail_proposal(originator='local', error='SIP core error: %s' % str(e))
	else:
	self.greenlet = None
	self.state = 'connected'
	self.streams += accepted_streams
	proposed_streams = self.proposed_streams
	self.proposed_streams = None
	any_stream_ice = any(getattr(stream, 'ice_active', False) for stream in accepted_streams)
	if any_stream_ice:
	self._reinvite_after_ice()
	notification_center.post_notification('SIPSessionProposalAccepted', self, NotificationData(originator='local', accepted_streams=accepted_streams, proposed_streams=proposed_streams))
	notification_center.post_notification('SIPSessionDidRenegotiateStreams', self, NotificationData(originator='local', added_streams=accepted_streams, removed_streams=[]))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	self._send_hold()

	def remove_stream(self, stream):
	self.remove_streams([stream])

	@transition_state('connected', 'sending_proposal')
	@run_in_green_thread
	def remove_streams(self, streams):
	streams = list(set(streams).intersection(self.streams))
	if not streams:
	self.state = 'connected'
	return

	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()
	unhandled_notifications = []

	try:
	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	for stream in streams:
	notification_center.remove_observer(self, sender=stream)
	stream.deactivate()
	self.streams.remove(stream)
	media = local_sdp.media[stream.index]
	media.port = 0
	media.attributes = []
	media.bandwidth_info = []

	self._invitation.send_reinvite(sdp=local_sdp)

	received_invitation_state = False
	received_sdp_update = False

	with api.timeout(self.short_reinvite_timeout):
	while not received_invitation_state or not received_sdp_update:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for s in self.streams:
	s.update(local_sdp, remote_sdp, s.index)
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	if not (200 <= notification.data.code < 300):
	break
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	except InvitationDisconnectedError, e:
	for stream in streams:
	stream.end()
	self.greenlet = None
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	except (api.TimeoutError, MediaStreamDidFailError, SIPCoreError):
	for stream in streams:
	stream.end()
	self.end()
	else:
	for stream in streams:
	stream.end()
	self.greenlet = None
	self.state = 'connected'
	notification_center.post_notification('SIPSessionDidRenegotiateStreams', self, NotificationData(originator='local', added_streams=[], removed_streams=streams))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	self._send_hold()

	@transition_state('sending_proposal', 'cancelling_proposal')
	@run_in_green_thread
	def cancel_proposal(self):
	if self.greenlet is not None:
	api.kill(self.greenlet, api.GreenletExit())
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()
	try:
	self._invitation.cancel_reinvite()
	while True:
	try:
	notification = self._channel.wait()
	except MediaStreamDidFailError:
	continue
	if notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	if notification.data.code == 487:
	proposed_streams = (self.proposed_streams or [])[:]
	for stream in proposed_streams:
	stream.deactivate()
	stream.end()
	self.state = 'connected'
	self.proposed_streams = None
	notification_center.post_notification('SIPSessionProposalRejected', self, NotificationData(originator='local', code=notification.data.code, reason=notification.data.reason, proposed_streams=proposed_streams))
	elif notification.data.code == 200:
	self.end()
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	break
	except SIPCoreError, e:
	proposed_streams = (self.proposed_streams or [])[:]
	for stream in proposed_streams:
	stream.deactivate()
	stream.end()
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', code=0, reason=None, failure_reason='SIP core error: %s' % str(e), redirect_identities=None))
	self.greenlet = None
	self.state = 'connected'
	self.proposed_streams = None
	notification_center.post_notification('SIPSessionProposalRejected', self, NotificationData(originator='local', code=0, reason='SIP core error: %s' % str(e), proposed_streams=proposed_streams))
	except InvitationDisconnectedError, e:
	self.proposed_streams = None
	self.greenlet = None
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	else:
	self.proposed_streams = None
	self.greenlet = None
	self.state = 'connected'
	finally:
	if self._hold_in_progress:
	self._send_hold()

	@run_in_green_thread
	def hold(self):
	if self.on_hold or self._hold_in_progress:
	return
	self._hold_in_progress = True
	streams = (self.streams or []) + (self.proposed_streams or [])
	if not streams:
	return
	for stream in streams:
	stream.hold()
	if self.state == 'connected':
	self._send_hold()

	@run_in_green_thread
	def unhold(self):
	if not self.on_hold and not self._hold_in_progress:
	return
	self._hold_in_progress = False
	streams = (self.streams or []) + (self.proposed_streams or [])
	if not streams:
	return
	for stream in streams:
	stream.unhold()
	if self.state == 'connected':
	self._send_unhold()

	@run_in_green_thread
	def end(self):
	if self.state in (None, 'terminating', 'terminated'):
	return
	if self.greenlet is not None:
	api.kill(self.greenlet, api.GreenletExit())
	self.greenlet = None
	notification_center = NotificationCenter()
	if self._invitation is None:
	# The invitation was not yet constructed
	self.state = 'terminated'
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=487, reason='Session Cancelled', failure_reason='user request', redirect_identities=None))
	return
	elif self._invitation.state is None:
	# The invitation was built but never sent
	streams = (self.streams or []) + (self.proposed_streams or [])
	for stream in streams[:]:
	try:
	notification_center.remove_observer(self, sender=stream)
	except KeyError:
	streams.remove(stream)
	else:
	stream.deactivate()
	stream.end()
	self.state = 'terminated'
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=487, reason='Session Cancelled', failure_reason='user request', redirect_identities=None))
	return
	invitation_state = self._invitation.state
	if invitation_state in ('disconnecting', 'disconnected'):
	return
	self.greenlet = api.getcurrent()
	self.state = 'terminating'
	if invitation_state == 'connected':
	notification_center.post_notification('SIPSessionWillEnd', self, NotificationData(originator='local'))
	streams = (self.streams or []) + (self.proposed_streams or [])
	for stream in streams[:]:
	try:
	notification_center.remove_observer(self, sender=stream)
	except KeyError:
	streams.remove(stream)
	else:
	stream.deactivate()
	cancelling = invitation_state != 'connected' and self.direction == 'outgoing'
	try:
	self._invitation.end(timeout=1)
	while True:
	try:
	notification = self._channel.wait()
	except MediaStreamDidFailError:
	continue
	if notification.name == 'SIPInvitationChangedState' and notification.data.state == 'disconnected':
	if notification.data.disconnect_reason in ('internal error', 'missing ACK'):
	pass
	elif notification.data.disconnect_reason == 'timeout':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='local' if self.direction=='outgoing' else 'remote', method='INVITE', code=408, reason='Timeout'))
	elif cancelling:
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='local', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	elif hasattr(notification.data, 'method'):
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='remote', method=notification.data.method, code=200, reason=sip_status_messages[200]))
	elif notification.data.disconnect_reason == 'user request':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self,
	NotificationData(originator='local', method='BYE', code=notification.data.code, reason=notification.data.reason))
	break
	except SIPCoreError, e:
	if cancelling:
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=0, reason=None, failure_reason='SIP core error: %s' % str(e), redirect_identities=None))
	else:
	self.end_time = ISOTimestamp.now()
	notification_center.post_notification('SIPSessionDidEnd', self, NotificationData(originator='local', end_reason='SIP core error: %s' % str(e)))
	except InvitationDisconnectedError, e:
	# As it weird as it may sound, PJSIP accepts a BYE even without receiving a final response to the INVITE
	if e.data.prev_state == 'connected':
	if e.data.originator == 'remote':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator=e.data.originator, method=e.data.method, code=200, reason=sip_status_messages[200]))
	self.end_time = ISOTimestamp.now()
	notification_center.post_notification('SIPSessionDidEnd', self, NotificationData(originator=e.data.originator, end_reason=e.data.disconnect_reason))
	elif getattr(e.data, 'method', None) == 'BYE' and e.data.originator == 'remote':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator=e.data.originator, method=e.data.method, code=200, reason=sip_status_messages[200]))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator=e.data.originator, code=0, reason=None, failure_reason=e.data.disconnect_reason, redirect_identities=None))
	else:
	if e.data.originator == 'remote':
	code = e.data.code
	reason = e.data.reason
	elif e.data.disconnect_reason == 'timeout':
	code = 408
	reason = 'timeout'
	else:
	code = 0
	reason = None
	if e.data.originator == 'remote' and code // 100 == 3:
	redirect_identities = e.data.headers.get('Contact', [])
	else:
	redirect_identities = None
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=code, reason=reason))
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator=e.data.originator, code=code, reason=reason, failure_reason=e.data.disconnect_reason, redirect_identities=redirect_identities))
	else:
	if cancelling:
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=487, reason='Session Cancelled', failure_reason='user request', redirect_identities=None))
	else:
	self.end_time = ISOTimestamp.now()
	notification_center.post_notification('SIPSessionDidEnd', self, NotificationData(originator='local', end_reason='user request'))
	finally:
	for stream in streams:
	stream.end()
	notification_center.remove_observer(self, sender=self._invitation)
	self.greenlet = None
	self.state = 'terminated'

	@check_state(['connected'])
	@check_transfer_state(None, None)
	@run_in_twisted_thread
	def transfer(self, target_uri, replaced_session=None):
	notification_center = NotificationCenter()
	notification_center.post_notification('SIPSessionTransferNewOutgoing', self, NotificationData(transfer_destination=target_uri))
	try:
	self._invitation.transfer(target_uri, replaced_session._invitation.dialog_id if replaced_session is not None else None)
	except SIPCoreError, e:
	notification_center.post_notification('SIPSessionTransferDidFail', sender=self, data=NotificationData(code=500, reason=str(e)))

	@check_state(['connected', 'received_proposal', 'sending_proposal', 'accepting_proposal', 'rejecting_proposal', 'cancelling_proposal'])
	@check_transfer_state('incoming', 'starting')
	def accept_transfer(self):
	notification_center = NotificationCenter()
	notification_center.post_notification('SIPSessionTransferDidStart', sender=self)

	@check_state(['connected', 'received_proposal', 'sending_proposal', 'accepting_proposal', 'rejecting_proposal', 'cancelling_proposal'])
	@check_transfer_state('incoming', 'starting')
	def reject_transfer(self, code=603, reason=None):
	notification_center = NotificationCenter()
	notification_center.post_notification('SIPSessionTransferDidFail', self, NotificationData(code=code, reason=reason or sip_status_messages[code]))

	@property
	def local_identity(self):
	if self._invitation is not None and self._invitation.local_identity is not None:
	return self._invitation.local_identity
	else:
	return self._local_identity

	@property
	def peer_address(self):
	return self._invitation.peer_address if self._invitation is not None else None

	@property
	def remote_identity(self):
	if self._invitation is not None and self._invitation.remote_identity is not None:
	return self._invitation.remote_identity
	else:
	return self._remote_identity

	@property
	def remote_user_agent(self):
	return self._invitation.remote_user_agent if self._invitation is not None else None

	def _cancel_hold(self):
	notification_center = NotificationCenter()
	try:
	self._invitation.cancel_reinvite()
	while True:
	try:
	notification = self._channel.wait()
	except MediaStreamDidFailError:
	continue
	if notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	if notification.data.code == 200:
	self.end()
	return False
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	break
	except SIPCoreError, e:
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', code=0, reason=None, failure_reason='SIP core error: %s' % str(e), redirect_identities=None))
	except InvitationDisconnectedError, e:
	self.greenlet = None
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	return False
	return True

	def _send_hold(self):
	self.state = 'sending_proposal'
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()

	unhandled_notifications = []

	try:
	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	for stream in self.streams:
	local_sdp.media[stream.index] = stream.get_local_media(remote_sdp=None, index=stream.index)
	self._invitation.send_reinvite(sdp=local_sdp)

	received_invitation_state = False
	received_sdp_update = False

	with api.timeout(self.short_reinvite_timeout):
	while not received_invitation_state or not received_sdp_update:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for stream in self.streams:
	stream.update(local_sdp, remote_sdp, stream.index)
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	except InvitationDisconnectedError, e:
	self.greenlet = None
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	return
	except api.TimeoutError:
	if not self._cancel_hold():
	return
	except SIPCoreError:
	pass

	self.greenlet = None
	self.on_hold = True
	self.state = 'connected'
	hold_supported_streams = (stream for stream in self.streams if stream.hold_supported)
	notification_center.post_notification('SIPSessionDidChangeHoldState', self, NotificationData(originator='local', on_hold=True, partial=any(not stream.on_hold_by_local for stream in hold_supported_streams)))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	self._hold_in_progress = False
	else:
	for stream in self.streams:
	stream.unhold()
	self._send_unhold()

	def _send_unhold(self):
	self.state = 'sending_proposal'
	self.greenlet = api.getcurrent()
	notification_center = NotificationCenter()

	unhandled_notifications = []

	try:
	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	for stream in self.streams:
	local_sdp.media[stream.index] = stream.get_local_media(remote_sdp=None, index=stream.index)
	self._invitation.send_reinvite(sdp=local_sdp)

	received_invitation_state = False
	received_sdp_update = False

	with api.timeout(self.short_reinvite_timeout):
	while not received_invitation_state or not received_sdp_update:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for stream in self.streams:
	stream.update(local_sdp, remote_sdp, stream.index)
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=notification.data.code, reason=notification.data.reason))
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	except InvitationDisconnectedError, e:
	self.greenlet = None
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = notification_center
	self.handle_notification(notification)
	return
	except api.TimeoutError:
	if not self._cancel_hold():
	return
	except SIPCoreError:
	pass

	self.greenlet = None
	self.on_hold = False
	self.state = 'connected'
	notification_center.post_notification('SIPSessionDidChangeHoldState', self, NotificationData(originator='local', on_hold=False, partial=False))
	for notification in unhandled_notifications:
	self.handle_notification(notification)
	if self._hold_in_progress:
	for stream in self.streams:
	stream.hold()
	self._send_hold()

	def _fail(self, originator, code, reason, error, reason_header=None):
	notification_center = NotificationCenter()
	prev_inv_state = self._invitation.state
	self.state = 'terminating'
	if prev_inv_state not in (None, 'incoming', 'outgoing', 'early', 'connecting'):
	notification_center.post_notification('SIPSessionWillEnd', self, NotificationData(originator=originator))
	if self._invitation.state not in (None, 'disconnecting', 'disconnected'):
	try:
	if self._invitation.direction == 'incoming' and self._invitation.state in ('incoming', 'early'):
	if 400<=code<=699 and reason is not None:
	self._invitation.send_response(code, extra_headers=[reason_header] if reason_header is not None else [])
	else:
	self._invitation.end(extra_headers=[reason_header] if reason_header is not None else [])
	with api.timeout(1):
	while True:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationChangedState' and notification.data.state == 'disconnected':
	if prev_inv_state in ('connecting', 'connected'):
	if notification.data.disconnect_reason in ('timeout', 'missing ACK'):
	sip_code = 200
	sip_reason = 'OK'
	originator = 'local'
	elif hasattr(notification.data, 'method'):
	sip_code = 200
	sip_reason = 'OK'
	originator = 'remote'
	else:
	sip_code = notification.data.code
	sip_reason = notification.data.reason
	originator = 'local'
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator=originator, method='BYE', code=sip_code, reason=sip_reason))
	elif self._invitation.direction == 'incoming' and prev_inv_state in ('incoming', 'early'):
	ack_received = notification.data.disconnect_reason != 'missing ACK'
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=code, reason=reason, ack_received=ack_received))
	elif self._invitation.direction == 'outgoing' and prev_inv_state in ('outgoing', 'early'):
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='INVITE', code=487, reason='Session Cancelled'))
	break
	except SIPCoreError:
	pass
	except api.TimeoutError:
	if prev_inv_state in ('connecting', 'connected'):
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='local', method='BYE', code=408, reason=sip_status_messages[408]))
	notification_center.remove_observer(self, sender=self._invitation)
	self.state = 'terminated'
	notification_center.post_notification('SIPSessionDidFail', self, NotificationData(originator=originator, code=code, reason=reason, failure_reason=error, redirect_identities=None))
	self.greenlet = None

	def _fail_proposal(self, originator, error):
	notification_center = NotificationCenter()
	has_streams = bool(self.proposed_streams)
	for stream in self.proposed_streams:
	try:
	notification_center.remove_observer(self, sender=stream)
	except KeyError:
	# _fail_proposal can be called from reject_proposal, which means the stream will
	# not have been initialized or the session registered as an observer for it.
	pass
	else:
	stream.deactivate()
	stream.end()
	if originator == 'remote' and self._invitation.sub_state == 'received_proposal':
	try:
	self._invitation.send_response(488 if has_streams else 500)
	except SIPCoreError:
	pass
	else:
	notification_center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=500, reason=sip_status_messages[500], ack_received='unknown'))
	notification_center.post_notification('SIPSessionHadProposalFailure', self, NotificationData(originator=originator, failure_reason=error, proposed_streams=self.proposed_streams[:]))
	self.state = 'connected'
	self.proposed_streams = None
	self.greenlet = None

	@run_in_green_thread
	def handle_notification(self, notification):
	handler = getattr(self, '_NH_%s' % notification.name, Null)
	handler(notification)

	def _NH_SIPInvitationChangedState(self, notification):
	if self.state == 'terminated':
	return
	if notification.data.originator == 'remote' and notification.data.state not in ('disconnecting', 'disconnected'):
	contact_header = notification.data.headers.get('Contact', None)
	if contact_header and 'isfocus' in contact_header[0].parameters:
	self.remote_focus = True
	if self.greenlet is not None:
	if notification.data.state == 'disconnected' and notification.data.prev_state != 'disconnecting':
	self._channel.send_exception(InvitationDisconnectedError(notification.sender, notification.data))
	else:
	self._channel.send(notification)
	else:
	self.greenlet = api.getcurrent()
	unhandled_notifications = []
	try:
	if notification.data.state == 'connected' and notification.data.sub_state == 'received_proposal':
	self.state = 'received_proposal'
	try:
	proposed_remote_sdp = self._invitation.sdp.proposed_remote
	active_remote_sdp = self._invitation.sdp.active_remote
	if len(proposed_remote_sdp.media) < len(active_remote_sdp.media):
	engine = Engine()
	self._invitation.send_response(488, extra_headers=[WarningHeader(399, engine.user_agent, 'Streams cannot be deleted from the SDP')])
	self.state = 'connected'
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=488, reason=sip_status_messages[488], ack_received='unknown'))
	return
	for stream in self.streams:
	if not stream.validate_update(proposed_remote_sdp, stream.index):
	engine = Engine()
	self._invitation.send_response(488, extra_headers=[WarningHeader(399, engine.user_agent, 'Failed to update media stream index %d' % stream.index)])
	self.state = 'connected'
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=488, reason=sip_status_messages[488], ack_received='unknown'))
	return
	added_media_indexes = set()
	removed_media_indexes = set()
	reused_media_indexes = set()
	for index, media_stream in enumerate(proposed_remote_sdp.media):
	if index >= len(active_remote_sdp.media):
	added_media_indexes.add(index)
	elif media_stream.port == 0 and active_remote_sdp.media[index].port > 0:
	removed_media_indexes.add(index)
	elif media_stream.port > 0 and active_remote_sdp.media[index].port == 0:
	reused_media_indexes.add(index)
	elif media_stream.media != active_remote_sdp.media[index].media:
	added_media_indexes.add(index)
	removed_media_indexes.add(index)
	if added_media_indexes \| reused_media_indexes and removed_media_indexes:
	engine = Engine()
	self._invitation.send_response(488, extra_headers=[WarningHeader(399, engine.user_agent, 'Both removing AND adding a media stream is currently not supported')])
	self.state = 'connected'
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=488, reason=sip_status_messages[488], ack_received='unknown'))
	return
	elif added_media_indexes \| reused_media_indexes:
	self.proposed_streams = []
	for index in added_media_indexes \| reused_media_indexes:
	media_stream = proposed_remote_sdp.media[index]
	if media_stream.port != 0:
	for stream_type in MediaStreamRegistry:
	try:
	stream = stream_type.new_from_sdp(self, proposed_remote_sdp, index)
	except UnknownStreamError:
	continue
	except InvalidStreamError as e:
	log.error("Invalid stream: {}".format(e))
	break
	except Exception as e:
	log.error("Exception occurred while setting up stream from SDP: {}".format(e))
	log.err()
	break
	else:
	stream.index = index
	self.proposed_streams.append(stream)
	break
	if self.proposed_streams:
	self._invitation.send_response(100)
	notification.center.post_notification('SIPSessionNewProposal', sender=self, data=NotificationData(originator='remote', proposed_streams=self.proposed_streams[:]))
	else:
	self._invitation.send_response(488)
	self.state = 'connected'
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=488, reason=sip_status_messages[488], ack_received='unknown'))
	return
	else:
	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	removed_streams = [stream for stream in self.streams if stream.index in removed_media_indexes]
	prev_on_hold_streams = set(stream for stream in self.streams if stream.hold_supported and stream.on_hold_by_remote)
	for stream in removed_streams:
	notification.center.remove_observer(self, sender=stream)
	stream.deactivate()
	media = local_sdp.media[stream.index]
	media.port = 0
	media.attributes = []
	media.bandwidth_info = []
	for stream in self.streams:
	local_sdp.media[stream.index] = stream.get_local_media(remote_sdp=proposed_remote_sdp, index=stream.index)
	try:
	self._invitation.send_response(200, sdp=local_sdp)
	except PJSIPError:
	for stream in removed_streams:
	self.streams.remove(stream)
	stream.end()
	if removed_streams:
	self.end()
	return
	else:
	try:
	self._invitation.send_response(488)
	except PJSIPError:
	self.end()
	return
	else:
	for stream in removed_streams:
	self.streams.remove(stream)
	stream.end()
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason=sip_status_messages[200], ack_received='unknown'))

	received_invitation_state = False
	received_sdp_update = False
	while not received_sdp_update or not received_invitation_state or self._channel:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for stream in self.streams:
	stream.update(local_sdp, remote_sdp, stream.index)
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	else:
	unhandled_notifications.append(notification)
	else:
	unhandled_notifications.append(notification)
	on_hold_streams = set(stream for stream in self.streams if stream.hold_supported and stream.on_hold_by_remote)
	if on_hold_streams != prev_on_hold_streams:
	hold_supported_streams = (stream for stream in self.streams if stream.hold_supported)
	notification.center.post_notification('SIPSessionDidChangeHoldState', self, NotificationData(originator='remote', on_hold=bool(on_hold_streams),
	partial=bool(on_hold_streams) and any(not stream.on_hold_by_remote for stream in hold_supported_streams)))
	if removed_media_indexes:
	notification.center.post_notification('SIPSessionDidRenegotiateStreams', self, NotificationData(originator='remote', added_streams=[], removed_streams=removed_streams))
	except InvitationDisconnectedError, e:
	self.greenlet = None
	self.state = 'connected'
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = NotificationCenter()
	self.handle_notification(notification)
	except SIPCoreError:
	self.end()
	else:
	self.state = 'connected'
	elif notification.data.state == 'connected' and notification.data.sub_state == 'received_proposal_request':
	self.state = 'received_proposal_request'
	try:
	# An empty proposal was received, generate an offer
	self._invitation.send_response(100)
	local_sdp = SDPSession.new(self._invitation.sdp.active_local)
	local_sdp.version += 1
	connection_address = host.outgoing_ip_for(self._invitation.peer_address.ip)
	if local_sdp.connection is not None:
	local_sdp.connection.address = connection_address
	for index, stream in enumerate(self.streams):
	stream.reset(index)
	media = stream.get_local_media(remote_sdp=None, index=index)
	if media.connection is not None:
	media.connection.address = connection_address
	local_sdp.media[stream.index] = media
	self._invitation.send_response(200, sdp=local_sdp)
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=200, reason=sip_status_messages[200], ack_received='unknown'))
	received_invitation_state = False
	received_sdp_update = False
	while not received_sdp_update or not received_invitation_state or self._channel:
	notification = self._channel.wait()
	if notification.name == 'SIPInvitationGotSDPUpdate':
	received_sdp_update = True
	if notification.data.succeeded:
	local_sdp = notification.data.local_sdp
	remote_sdp = notification.data.remote_sdp
	for stream in self.streams:
	stream.update(local_sdp, remote_sdp, stream.index)
	elif notification.name == 'SIPInvitationChangedState':
	if notification.data.state == 'connected' and notification.data.sub_state == 'normal':
	received_invitation_state = True
	elif notification.data.state == 'disconnected':
	raise InvitationDisconnectedError(notification.sender, notification.data)
	else:
	unhandled_notifications.append(notification)
	else:
	unhandled_notifications.append(notification)
	except InvitationDisconnectedError, e:
	self.greenlet = None
	self.state = 'connected'
	notification = Notification('SIPInvitationChangedState', e.invitation, e.data)
	notification.center = NotificationCenter()
	self.handle_notification(notification)
	except SIPCoreError:
	raise # FIXME
	else:
	self.state = 'connected'
	elif notification.data.prev_state == notification.data.state == 'connected' and notification.data.prev_sub_state == 'received_proposal' and notification.data.sub_state == 'normal':
	if notification.data.originator == 'local' and notification.data.code == 487:
	self.state = 'connected'
	proposed_streams = self.proposed_streams[:]
	self.proposed_streams = None
	notification.center.post_notification('SIPSessionProposalRejected', self, NotificationData(originator='remote', code=notification.data.code, reason=notification.data.reason, proposed_streams=proposed_streams))
	if self._hold_in_progress:
	self._send_hold()
	elif notification.data.state == 'disconnected':
	if self.state == 'incoming':
	self.state = 'terminated'
	if notification.data.originator == 'remote':
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator='remote', method='INVITE', code=487, reason='Session Cancelled', ack_received='unknown'))
	notification.center.post_notification('SIPSessionDidFail', self, NotificationData(originator='remote', code=487, reason='Session Cancelled', failure_reason=notification.data.disconnect_reason, redirect_identities=None))
	else:
	# There must have been an error involved
	notification.center.post_notification('SIPSessionDidFail', self, NotificationData(originator='local', code=0, reason=None, failure_reason=notification.data.disconnect_reason, redirect_identities=None))
	else:
	notification.center.post_notification('SIPSessionWillEnd', self, NotificationData(originator=notification.data.originator))
	for stream in self.streams:
	notification.center.remove_observer(self, sender=stream)
	stream.deactivate()
	stream.end()
	self.state = 'terminated'
	if notification.data.originator == 'remote':
	if hasattr(notification.data, 'method'):
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator=notification.data.originator, method=notification.data.method, code=200, reason=sip_status_messages[200]))
	else:
	notification.center.post_notification('SIPSessionDidProcessTransaction', self, NotificationData(originator=notification.data.originator, method='INVITE', code=notification.data.code, reason=notification.data.reason))
	self.end_time = ISOTimestamp.now()
	notification.center.post_notification('SIPSessionDidEnd', self, NotificationData(originator=notification.data.originator, end_reason=notification.data.disconnect_reason))
	notification.center.remove_observer(self, sender=self._invitation)
	finally:
	self.greenlet = None
	for notification in unhandled_notifications:
	self.handle_notification(notification)

	def _NH_SIPInvitationGotSDPUpdate(self, notification):
	if self.greenlet is not None:
	self._channel.send(notification)

	def _NH_MediaStreamDidInitialize(self, notification):
	if self.greenlet is not None:
	self._channel.send(notification)

	def _NH_RTPStreamDidEnableEncryption(self, notification):
	if notification.sender.type != 'audio':
	return
	audio_stream = notification.sender
	if audio_stream.encryption.type == 'ZRTP':
	# start ZRTP on the video stream, if applicable
	try:
	video_stream = next(stream for stream in self.streams or [] if stream.type=='video')
	except StopIteration:
	return
	if video_stream.encryption.type == 'ZRTP' and not video_stream.encryption.active:
	video_stream.encryption.zrtp._enable(audio_stream)

	def _NH_MediaStreamDidStart(self, notification):
	stream = notification.sender
	if stream.type == 'audio' and stream.encryption.type == 'ZRTP':
	stream.encryption.zrtp._enable()
	elif stream.type == 'video' and stream.encryption.type == 'ZRTP':
	# start ZRTP on the video stream, if applicable
	try:
	audio_stream = next(stream for stream in self.streams or [] if stream.type=='audio')
	except StopIteration:
	pass
	else:
	if audio_stream.encryption.type == 'ZRTP' and audio_stream.encryption.active:
	stream.encryption.zrtp._enable(audio_stream)
	if self.greenlet is not None:
	self._channel.send(notification)

	def _NH_MediaStreamDidNotInitialize(self, notification):
	if self.greenlet is not None and self.state not in ('terminating', 'terminated'):
	self._channel.send_exception(MediaStreamDidNotInitializeError(notification.sender, notification.data))

	def _NH_MediaStreamDidFail(self, notification):
	if self.greenlet is not None:
	if self.state not in ('terminating', 'terminated'):
	self._channel.send_exception(MediaStreamDidFailError(notification.sender, notification.data))
	else:
	stream = notification.sender
	if self.streams == [stream]:
	self.end()
	else:
	try:
	self.remove_stream(stream)
	except IllegalStateError:
	self.end()


	class SessionManager(object):
	__metaclass__ = Singleton
	implements(IObserver)

	def __init__(self):
	self.sessions = []
	self.state = None
	self._channel = coros.queue()

	def start(self):
	self.state = 'starting'
	notification_center = NotificationCenter()
	notification_center.post_notification('SIPSessionManagerWillStart', sender=self)
	notification_center.add_observer(self, 'SIPInvitationChangedState')
	notification_center.add_observer(self, 'SIPSessionNewIncoming')
	notification_center.add_observer(self, 'SIPSessionNewOutgoing')
	notification_center.add_observer(self, 'SIPSessionDidFail')
	notification_center.add_observer(self, 'SIPSessionDidEnd')
	self.state = 'started'
	notification_center.post_notification('SIPSessionManagerDidStart', sender=self)

	def stop(self):
	self.state = 'stopping'
	notification_center = NotificationCenter()
	notification_center.post_notification('SIPSessionManagerWillEnd', sender=self)
	for session in self.sessions:
	session.end()
	while self.sessions:
	self._channel.wait()
	notification_center.remove_observer(self, 'SIPInvitationChangedState')
	notification_center.remove_observer(self, 'SIPSessionNewIncoming')
	notification_center.remove_observer(self, 'SIPSessionNewOutgoing')
	notification_center.remove_observer(self, 'SIPSessionDidFail')
	notification_center.remove_observer(self, 'SIPSessionDidEnd')
	self.state = 'stopped'
	notification_center.post_notification('SIPSessionManagerDidEnd', sender=self)

	@run_in_twisted_thread
	def handle_notification(self, notification):
	if notification.name == 'SIPInvitationChangedState' and notification.data.state == 'incoming':
	account_manager = AccountManager()
	account = account_manager.find_account(notification.data.request_uri)
	if account is None:
	notification.sender.send_response(404)
	return
	notification.sender.send_response(100)
	session = Session(account)
	session.init_incoming(notification.sender, notification.data)
	elif notification.name in ('SIPSessionNewIncoming', 'SIPSessionNewOutgoing'):
	self.sessions.append(notification.sender)
	elif notification.name in ('SIPSessionDidFail', 'SIPSessionDidEnd'):
	self.sessions.remove(notification.sender)
	if self.state == 'stopping':
	self._channel.send(notification)

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