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	diff --git a/sylk/applications/conference/room.py b/sylk/applications/conference/room.py
	index 69e1b3f..ab74f44 100644
	--- a/sylk/applications/conference/room.py
	+++ b/sylk/applications/conference/room.py
	@@ -1,1165 +1,1164 @@
	# Copyright (C) 2010-2011 AG Projects. See LICENSE for details.
	#

	import hashlib
	import os
	import random
	import re
	import shutil
	import string
	import weakref

	from collections import defaultdict
	from datetime import datetime
	from glob import glob
	from itertools import chain, count, cycle

	try:
	from weakref import WeakSet
	except ImportError:
	from backports.weakref import WeakSet

	from application.notification import IObserver, NotificationCenter, NotificationData
	from application.python import Null
	from application.system import makedirs
	from eventlib import api, coros, proc
	from sipsimple.account import AccountManager
	from sipsimple.account.bonjour import BonjourPresenceState
	from sipsimple.application import SIPApplication
	from sipsimple.audio import WavePlayer, WavePlayerError
	from sipsimple.conference import AudioConference
	from sipsimple.configuration.settings import SIPSimpleSettings
	from sipsimple.core import Engine, SIPCoreError, SIPCoreInvalidStateError, SIPURI
	from sipsimple.core import Header, ContactHeader, FromHeader, ToHeader
	from sipsimple.lookup import DNSLookup, DNSLookupError
	from sipsimple.payloads import conference
	from sipsimple.streams import FileTransferStream
	from sipsimple.streams.applications.chat import CPIMIdentity
	from sipsimple.streams.msrp import ChatStreamError, FileSelector
	from sipsimple.threading import run_in_thread, run_in_twisted_thread
	from sipsimple.threading.green import run_in_green_thread
	from twisted.internet import reactor
	from zope.interface import implements

	from sylk.applications.conference import database
	from sylk.applications.conference.configuration import ConferenceConfig, URL
	from sylk.applications.conference.logger import log
	from sylk.bonjour import BonjourServices
	from sylk.configuration import ServerConfig, SIPConfig, ThorNodeConfig
	from sylk.configuration.datatypes import ResourcePath
	from sylk.session import Session


	def format_identity(identity, cpim_format=False):
	uri = identity.uri
	if identity.display_name:
	return u'%s <sip:%s@%s>' % (identity.display_name, uri.user, uri.host)
	elif cpim_format:
	return u'<sip:%s@%s>' % (uri.user, uri.host)
	else:
	return u'sip:%s@%s' % (uri.user, uri.host)


	class ScreenImage(object):
	def __init__(self, room, sender):
	self.room = weakref.ref(room)
	self.room_uri = room.uri
	self.sender = sender
	self.filename = os.path.join(ConferenceConfig.screen_sharing_dir, room.uri, '%s@%s_%s.jpg' % (sender.uri.user, sender.uri.host, ''.join(random.sample(string.letters+string.digits, 10))))
	from sylk.applications.conference import ConferenceApplication
	port = ConferenceApplication().screen_sharing_web_server.port
	scheme = 'https' if ConferenceConfig.screen_sharing_use_https else 'http'
	self.url = URL('%s://%s:%s/' % (scheme, ConferenceConfig.screen_sharing_ip.normalized, port))
	self.url.query_items['image'] = os.path.join(room.uri, os.path.basename(self.filename))
	self.state = None
	self.timer = None

	@property
	def active(self):
	return self.state == 'active'

	@property
	def idle(self):
	return self.state == 'idle'

	@run_in_thread('file-io')
	def save(self, image):
	makedirs(os.path.dirname(self.filename))
	tmp_filename = self.filename + '.tmp'
	try:
	with open(tmp_filename, 'wb') as file:
	file.write(image)
	except EnvironmentError, e:
	log.msg('Room %s - cannot write screen sharing image: %s: %s' % (self.room_uri, self.filename, e))
	else:
	try:
	os.rename(tmp_filename, self.filename)
	except EnvironmentError:
	pass
	self.advertise()

	@run_in_twisted_thread
	def advertise(self):
	if self.state == 'active':
	self.timer.reset(10)
	else:
	if self.timer is not None and self.timer.active():
	self.timer.cancel()
	self.state = 'active'
	self.timer = reactor.callLater(10, self.stop_advertising)
	room = self.room() or Null
	room.dispatch_conference_info()
	txt = 'Room %s - %s is sharing the screen at %s' % (self.room_uri, format_identity(self.sender, cpim_format=True), self.url)
	room.dispatch_server_message(txt)
	log.msg(txt)

	@run_in_twisted_thread
	def stop_advertising(self):
	if self.state != 'idle':
	if self.timer is not None and self.timer.active():
	self.timer.cancel()
	self.state = 'idle'
	self.timer = None
	room = self.room() or Null
	room.dispatch_conference_info()
	txt = '%s stopped sharing the screen' % format_identity(self.sender, cpim_format=True)
	room.dispatch_server_message(txt)
	log.msg(txt)


	class Room(object):
	"""
	Object representing a conference room, it will handle the message dispatching
	among all the participants.
	"""
	implements(IObserver)

	def __init__(self, uri):
	self.uri = uri
	- self.identity = CPIMIdentity.parse('<sip:%s>' % self.uri)
	- self.identity.display_name = 'Conference Room'
	+ self.identity = CPIMIdentity(SIPURI.parse('sip:%s' % self.uri), display_name='Conference Room')
	self.files = []
	self.screen_images = {}
	self.sessions = []
	self.sessions_with_proposals = {}
	self.subscriptions = []
	self.transfer_handlers = WeakSet()
	self.state = 'stopped'
	self.incoming_message_queue = coros.queue()
	self.message_dispatcher = None
	self.audio_conference = None
	self.moh_player = None
	self.conference_info_payload = None
	self.conference_info_version = count(1)
	self.bonjour_services = Null()
	self.session_nickname_map = {}
	self.last_nicknames_map = {}
	self.participants_counter = defaultdict(lambda: 0)

	@property
	def empty(self):
	return len(self.sessions) == 0

	@property
	def started(self):
	return self.state == 'started'

	@property
	def stopping(self):
	return self.state in ('stopping', 'stopped')

	@property
	def active_media(self):
	return set((stream.type for stream in chain(*(session.streams for session in self.sessions if session.streams))))

	def start(self):
	if self.started:
	return
	if ServerConfig.enable_bonjour and self.identity.uri.user != 'conference':
	room_user = self.identity.uri.user
	self.bonjour_services = BonjourServices(service='sipuri', name='Conference Room %s' % room_user, uri_user=room_user)
	self.bonjour_services.start()
	self.message_dispatcher = proc.spawn(self._message_dispatcher)
	self.audio_conference = AudioConference()
	self.audio_conference.hold()
	self.moh_player = MoHPlayer(self.audio_conference)
	self.moh_player.start()
	self.state = 'started'

	def stop(self):
	if not self.started:
	return
	self.state = 'stopping'
	self.bonjour_services.stop()
	self.bonjour_services = None
	self.incoming_message_queue.send_exception(api.GreenletExit)
	self.incoming_message_queue = None
	self.message_dispatcher.kill(proc.ProcExit)
	self.message_dispatcher = None
	self.moh_player.stop()
	self.moh_player = None
	self.audio_conference = None
	[handler.stop() for handler in self.transfer_handlers]
	notification_center = NotificationCenter()
	for subscription in self.subscriptions:
	notification_center.remove_observer(self, sender=subscription)
	subscription.end()
	self.subscriptions = []
	self.cleanup_files()
	self.conference_info_payload = None
	self.state = 'stopped'

	@run_in_thread('file-io')
	def cleanup_files(self):
	path = os.path.join(ConferenceConfig.file_transfer_dir, self.uri)
	try:
	shutil.rmtree(path)
	except EnvironmentError:
	pass
	path = os.path.join(ConferenceConfig.screen_sharing_dir, self.uri)
	try:
	shutil.rmtree(path)
	except EnvironmentError:
	pass

	def _message_dispatcher(self):
	"""Read from self.incoming_message_queue and dispatch the messages to other participants"""
	while True:
	session, message_type, data = self.incoming_message_queue.wait()
	if message_type == 'message':
	message = data.message
	if message.sender.uri != session.remote_identity.uri:
	continue
	if message.timestamp is not None:
	value = message.timestamp
	timestamp = datetime(value.year, value.month, value.day, value.hour, value.minute, value.second, value.microsecond, value.tzinfo)
	else:
	timestamp = datetime.utcnow()
	recipient = message.recipients[0]
	sender = message.sender
	sender.display_name = self.last_nicknames_map.get(str(session.remote_identity.uri), sender.display_name)
	message.sender = sender
	database.async_save_message(format_identity(session.remote_identity, True), self.uri, message.body, message.content_type, unicode(message.sender), unicode(recipient), timestamp)
	private = len(message.recipients) == 1 and recipient.uri != self.identity.uri
	if private:
	self.dispatch_private_message(session, message)
	else:
	self.dispatch_message(session, message)
	elif message_type == 'composing_indication':
	if data.sender.uri != session.remote_identity.uri:
	continue
	recipient = data.recipients[0]
	private = len(data.recipients) == 1 and recipient.uri != self.identity.uri
	if private:
	self.dispatch_private_iscomposing(session, data)
	else:
	self.dispatch_iscomposing(session, data)

	def dispatch_message(self, session, message):
	for s in (s for s in self.sessions if s is not session):
	try:
	chat_stream = (stream for stream in s.streams if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	try:
	chat_stream.send_message(message.body, message.content_type, local_identity=message.sender, recipients=[self.identity], timestamp=message.timestamp, additional_headers=message.additional_headers)
	except ChatStreamError, e:
	log.error(u'Error dispatching message to %s: %s' % (s.remote_identity.uri, e))

	def dispatch_private_message(self, session, message):
	# Private messages are delivered to all sessions matching the recipient but also to the sender,
	# for replication in clients
	recipient = message.recipients[0]
	for s in (s for s in self.sessions if s is not session and s.remote_identity.uri in (recipient.uri, session.remote_identity.uri)):
	try:
	chat_stream = (stream for stream in s.streams if stream.type == 'chat').next()
	except StopIteration:
	continue
	else:
	try:
	chat_stream.send_message(message.body, message.content_type, local_identity=message.sender, recipients=[recipient], timestamp=message.timestamp, additional_headers=message.additional_headers)
	except ChatStreamError, e:
	log.error(u'Error dispatching private message to %s: %s' % (s.remote_identity.uri, e))

	def dispatch_iscomposing(self, session, data):
	for s in (s for s in self.sessions if s is not session):
	try:
	chat_stream = (stream for stream in s.streams if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	identity = CPIMIdentity.parse(format_identity(session.remote_identity, True))
	try:
	chat_stream.send_composing_indication(data.state, data.refresh, local_identity=identity, recipients=[self.identity])
	except ChatStreamError, e:
	log.error(u'Error dispatching composing indication to %s: %s' % (s.remote_identity.uri, e))

	def dispatch_private_iscomposing(self, session, data):
	recipient_uri = data.recipients[0].uri
	for s in (s for s in self.sessions if s is not session and s.remote_identity.uri == recipient_uri):
	try:
	chat_stream = (stream for stream in s.streams if stream.type == 'chat').next()
	except StopIteration:
	continue
	else:
	identity = CPIMIdentity.parse(format_identity(session.remote_identity, True))
	try:
	chat_stream.send_composing_indication(data.state, data.refresh, local_identity=identity)
	except ChatStreamError, e:
	log.error(u'Error dispatching private composing indication to %s: %s' % (s.remote_identity.uri, e))

	def dispatch_server_message(self, body, content_type='text/plain', exclude=None):
	for session in (session for session in self.sessions if session is not exclude):
	try:
	chat_stream = (stream for stream in session.streams if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	chat_stream.send_message(body, content_type, local_identity=self.identity, recipients=[self.identity])
	self_identity = format_identity(self.identity, cpim_format=True)
	database.async_save_message(self_identity, self.uri, body, content_type, self_identity, self_identity, datetime.now())

	def dispatch_conference_info(self):
	data = self.build_conference_info_payload()
	for subscription in (subscription for subscription in self.subscriptions if subscription.state == 'active'):
	try:
	subscription.push_content(conference.ConferenceDocument.content_type, data)
	except (SIPCoreError, SIPCoreInvalidStateError):
	pass

	def dispatch_file(self, file):
	sender_uri = CPIMIdentity.parse(file.sender).uri
	for uri in set(session.remote_identity.uri for session in self.sessions if str(session.remote_identity.uri) != str(sender_uri)):
	handler = OutgoingFileTransferHandler(self, uri, file)
	self.transfer_handlers.add(handler)
	handler.start()

	def add_session(self, session):
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=session)
	self.sessions.append(session)
	remote_uri = str(session.remote_identity.uri)
	self.participants_counter[remote_uri] += 1
	try:
	chat_stream = (stream for stream in session.streams if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	notification_center.add_observer(self, sender=chat_stream)
	try:
	audio_stream = (stream for stream in session.streams if stream.type == 'audio').next()
	except StopIteration:
	pass
	else:
	notification_center.add_observer(self, sender=audio_stream)
	log.msg(u'Room %s - audio stream %s/%sHz (%s), end-points: %s:%d <-> %s:%d' % (self.uri, audio_stream.codec, audio_stream.sample_rate,
	'encrypted' if audio_stream.srtp_active else 'unencrypted',
	audio_stream.local_rtp_address, audio_stream.local_rtp_port,
	audio_stream.remote_rtp_address, audio_stream.remote_rtp_port))
	try:
	transfer_stream = (stream for stream in session.streams if stream.type == 'file-transfer').next()
	except StopIteration:
	pass
	else:
	if transfer_stream.direction == 'recvonly':
	transfer_handler = IncomingFileTransferHandler(self, session)
	transfer_handler.start()
	txt = u'Room %s - %s is uploading file %s (%s)' % (self.uri, format_identity(session.remote_identity, cpim_format=True), transfer_stream.file_selector.name.decode('utf-8'), self.format_file_size(transfer_stream.file_selector.size))
	else:
	transfer_handler = OutgoingFileTransferRequestHandler(self, session)
	transfer_handler.start()
	txt = u'Room %s - %s requested file %s' % (self.uri, format_identity(session.remote_identity, cpim_format=True), transfer_stream.file_selector.name.decode('utf-8'))
	log.msg(txt)
	self.dispatch_server_message(txt)
	if len(session.streams) == 1:
	return

	welcome_handler = WelcomeHandler(self, session)
	welcome_handler.start()
	self.dispatch_conference_info()

	if len(self.sessions) == 1:
	log.msg(u'Room %s - started by %s with %s' % (self.uri, format_identity(session.remote_identity), self.format_stream_types(session.streams)))
	else:
	log.msg(u'Room %s - %s joined with %s' % (self.uri, format_identity(session.remote_identity), self.format_stream_types(session.streams)))
	if str(session.remote_identity.uri) not in set(str(s.remote_identity.uri) for s in self.sessions if s is not session):
	self.dispatch_server_message('%s has joined the room %s' % (format_identity(session.remote_identity), self.format_stream_types(session.streams)), exclude=session)

	if ServerConfig.enable_bonjour:
	self._update_bonjour_presence()

	def remove_session(self, session):
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=session)
	self.sessions.remove(session)
	self.session_nickname_map.pop(session, None)
	remote_uri = str(session.remote_identity.uri)
	self.participants_counter[remote_uri] -= 1
	if self.participants_counter[remote_uri] <= 0:
	del self.participants_counter[remote_uri]
	self.last_nicknames_map.pop(remote_uri, None)
	try:
	timer = self.sessions_with_proposals.pop(session)
	except KeyError:
	pass
	else:
	if timer.active():
	timer.cancel()
	try:
	chat_stream = (stream for stream in session.streams or [] if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	notification_center.remove_observer(self, sender=chat_stream)
	try:
	audio_stream = (stream for stream in session.streams or [] if stream.type == 'audio').next()
	except StopIteration:
	pass
	else:
	notification_center.remove_observer(self, sender=audio_stream)
	try:
	self.audio_conference.remove(audio_stream)
	except ValueError:
	# User may hangup before getting bridged into the conference
	pass
	if len(self.audio_conference.streams) == 0:
	self.moh_player.pause()
	self.audio_conference.hold()
	elif len(self.audio_conference.streams) == 1:
	self.moh_player.play()
	try:
	transfer_stream = (stream for stream in session.streams if stream.type == 'file-transfer').next()
	except StopIteration:
	pass
	else:
	if len(session.streams) == 1:
	return

	self.dispatch_conference_info()
	log.msg(u'Room %s - %s left conference after %s' % (self.uri, format_identity(session.remote_identity), self.format_session_duration(session)))
	if not self.sessions:
	log.msg(u'Room %s - Last participant left conference' % self.uri)
	if str(session.remote_identity.uri) not in set(str(s.remote_identity.uri) for s in self.sessions if s is not session):
	self.dispatch_server_message('%s has left the room after %s' % (format_identity(session.remote_identity), self.format_session_duration(session)))

	if ServerConfig.enable_bonjour:
	self._update_bonjour_presence()

	def terminate_sessions(self, uri):
	if not self.started:
	return
	for session in (session for session in self.sessions if session.remote_identity.uri == uri):
	session.end()

	def build_conference_info_payload(self):
	if self.conference_info_payload is None:
	settings = SIPSimpleSettings()
	conference_description = conference.ConferenceDescription(display_text='Ad-hoc conference', free_text='Hosted by %s' % settings.user_agent)
	host_info = conference.HostInfo(web_page=conference.WebPage('http://sylkserver.com'))
	self.conference_info_payload = conference.Conference(self.identity.uri, conference_description=conference_description, host_info=host_info, users=conference.Users())
	self.conference_info_payload.version = next(self.conference_info_version)
	user_count = len(self.participants_counter.keys())
	self.conference_info_payload.conference_state = conference.ConferenceState(user_count=user_count, active=True)
	users = conference.Users()
	for session in (session for session in self.sessions if not (len(session.streams) == 1 and session.streams[0].type == 'file-transfer')):
	try:
	user = (user for user in users if user.entity == str(session.remote_identity.uri)).next()
	except StopIteration:
	display_text = self.last_nicknames_map.get(str(session.remote_identity.uri), session.remote_identity.display_name)
	user = conference.User(str(session.remote_identity.uri), display_text=display_text)
	user_uri = '%s@%s' % (session.remote_identity.uri.user, session.remote_identity.uri.host)
	screen_image = self.screen_images.get(user_uri, None)
	if screen_image is not None and screen_image.active:
	user.screen_image_url = screen_image.url
	users.add(user)
	joining_info = conference.JoiningInfo(when=session.start_time)
	holdable_streams = [stream for stream in session.streams if stream.hold_supported]
	session_on_hold = holdable_streams and all(stream.on_hold_by_remote for stream in holdable_streams)
	hold_status = conference.EndpointStatus('on-hold' if session_on_hold else 'connected')
	display_text = self.session_nickname_map.get(session, session.remote_identity.display_name)
	endpoint = conference.Endpoint(str(session._invitation.remote_contact_header.uri), display_text=display_text, joining_info=joining_info, status=hold_status)
	for stream in session.streams:
	if stream.type == 'file-transfer':
	continue
	endpoint.add(conference.Media(id(stream), media_type=self.format_conference_stream_type(stream)))
	user.add(endpoint)
	self.conference_info_payload.users = users
	if self.files:
	files = conference.FileResources(conference.FileResource(os.path.basename(file.name), file.hash, file.size, file.sender, file.status) for file in self.files)
	self.conference_info_payload.conference_description.resources = conference.Resources(files=files)
	return self.conference_info_payload.toxml()

	def handle_incoming_subscription(self, subscribe_request, data):
	log.msg('Room %s - subscription from %s' % (self.uri, data.headers['From'].uri))
	if subscribe_request.event != 'conference':
	log.msg('Room %s - Subscription rejected: only conference event is supported' % self.uri)
	subscribe_request.reject(489)
	return
	NotificationCenter().add_observer(self, sender=subscribe_request)
	self.subscriptions.append(subscribe_request)
	data = self.build_conference_info_payload()
	subscribe_request.accept(conference.ConferenceDocument.content_type, data)

	def accept_proposal(self, session, streams):
	self.sessions_with_proposals.pop(session)
	session.accept_proposal(streams)

	def add_file(self, file):
	if file.status == 'INCOMPLETE':
	self.dispatch_server_message('%s has cancelled upload of file %s (%s)' % (file.sender, os.path.basename(file.name), self.format_file_size(file.size)))
	else:
	self.dispatch_server_message('%s has uploaded file %s (%s)' % (file.sender, os.path.basename(file.name), self.format_file_size(file.size)))
	self.files.append(file)
	self.dispatch_conference_info()
	if ConferenceConfig.push_file_transfer:
	self.dispatch_file(file)

	def add_screen_image(self, sender, image):
	sender_uri = '%s@%s' % (sender.uri.user, sender.uri.host)
	screen_image = self.screen_images.setdefault(sender_uri, ScreenImage(self, sender))
	screen_image.save(image)

	def _update_bonjour_presence(self):
	num = len(self.sessions)
	if num == 0:
	num_str = 'No'
	elif num == 1:
	num_str = 'One'
	elif num == 2:
	num_str = 'Two'
	else:
	num_str = str(num)
	txt = u'%s participant%s' % (num_str, '' if num==1 else 's')
	presence_state = BonjourPresenceState('available', txt)
	if self.bonjour_services is Null:
	# This is the room being published all the time
	from sylk.applications.conference import ConferenceApplication
	ConferenceApplication().bonjour_room_service.presence_state = presence_state
	else:
	self.bonjour_services.presence_state = presence_state

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

	def _NH_AudioStreamDidTimeout(self, notification):
	stream = notification.sender
	session = stream.session
	log.msg(u'Room %s - audio stream for session %s timed out' % (self.uri, format_identity(session.remote_identity)))
	if session.streams == [stream]:
	session.end()

	def _NH_ChatStreamGotMessage(self, notification):
	stream = notification.sender
	stream.msrp_session.send_report(notification.data.chunk, 200, 'OK')
	data = notification.data
	session = notification.sender.session
	message = data.message
	content_type = message.content_type.lower()
	if content_type.startswith('text/'):
	self.incoming_message_queue.send((session, 'message', data))
	elif content_type == 'application/blink-screensharing':
	self.add_screen_image(message.sender, message.body)

	def _NH_ChatStreamGotComposingIndication(self, notification):
	stream = notification.sender
	stream.msrp_session.send_report(notification.data.chunk, 200, 'OK')
	data = notification.data
	session = notification.sender.session
	self.incoming_message_queue.send((session, 'composing_indication', data))

	def _NH_ChatStreamGotNicknameRequest(self, notification):
	nickname = notification.data.nickname
	session = notification.sender.session
	chunk = notification.data.chunk
	if nickname:
	if nickname in self.session_nickname_map.values() and (session not in self.session_nickname_map or self.session_nickname_map[session] != nickname):
	notification.sender.reject_nickname(chunk, 425, 'Nickname reserved or already in use')
	return
	self.session_nickname_map[session] = nickname
	self.last_nicknames_map[str(session.remote_identity.uri)] = nickname
	else:
	self.session_nickname_map.pop(session, None)
	self.last_nicknames_map.pop(str(session.remote_identity.uri), None)
	notification.sender.accept_nickname(chunk)
	self.dispatch_conference_info()

	def _NH_SIPIncomingSubscriptionDidEnd(self, notification):
	subscription = notification.sender
	notification.center.remove_observer(self, sender=subscription)
	try:
	self.subscriptions.remove(subscription)
	except ValueError:
	pass

	def _NH_SIPSessionDidChangeHoldState(self, notification):
	session = notification.sender
	if notification.data.originator == 'remote':
	if notification.data.on_hold:
	log.msg(u'Room %s - %s has put the audio session on hold' % (self.uri, format_identity(session.remote_identity)))
	else:
	log.msg(u'Room %s - %s has taken the audio session out of hold' % (self.uri, format_identity(session.remote_identity)))
	self.dispatch_conference_info()

	def _NH_SIPSessionGotProposal(self, notification):
	session = notification.sender
	audio_streams = [stream for stream in notification.data.streams if stream.type=='audio']
	chat_streams = [stream for stream in notification.data.streams if stream.type=='chat']
	if not audio_streams and not chat_streams:
	session.reject_proposal()
	return
	streams = [streams[0] for streams in (audio_streams, chat_streams) if streams]
	timer = reactor.callLater(4, self.accept_proposal, session, streams)
	self.sessions_with_proposals[session] = timer

	def _NH_SIPSessionGotRejectProposal(self, notification):
	session = notification.sender
	try:
	timer = self.sessions_with_proposals.pop(session)
	except KeyError:
	# If the proposal couldn't be accepted by us we will not add a timer
	pass
	else:
	if timer.active():
	timer.cancel()

	def _NH_SIPSessionDidRenegotiateStreams(self, notification):
	session = notification.sender
	streams = notification.data.streams
	if notification.data.action == 'add':
	try:
	chat_stream = (stream for stream in streams if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	notification.center.add_observer(self, sender=chat_stream)
	log.msg(u'Room %s - %s has added chat to %s' % (self.uri, format_identity(session.remote_identity)))
	self.dispatch_server_message('%s has added chat' % format_identity(session.remote_identity), exclude=session)
	try:
	audio_stream = (stream for stream in streams if stream.type == 'audio').next()
	except StopIteration:
	pass
	else:
	notification.center.add_observer(self, sender=audio_stream)
	log.msg(u'Room %s - audio stream %s/%sHz (%s), end-points: %s:%d <-> %s:%d' % (self.uri, audio_stream.codec, audio_stream.sample_rate,
	'encrypted' if audio_stream.srtp_active else 'unencrypted',
	audio_stream.local_rtp_address, audio_stream.local_rtp_port,
	audio_stream.remote_rtp_address, audio_stream.remote_rtp_port))
	log.msg(u'Room %s - %s has added audio' % (self.uri, format_identity(session.remote_identity)))
	self.dispatch_server_message('%s has added audio' % format_identity(session.remote_identity), exclude=session)
	welcome_handler = WelcomeHandler(self, session)
	welcome_handler.start(welcome_prompt=False)
	elif notification.data.action == 'remove':
	try:
	chat_stream = (stream for stream in streams if stream.type == 'chat').next()
	except StopIteration:
	pass
	else:
	notification.center.remove_observer(self, sender=chat_stream)
	log.msg(u'Room %s - %s has removed chat' % (self.uri, format_identity(session.remote_identity)))
	self.dispatch_server_message('%s has removed chat' % format_identity(session.remote_identity), exclude=session)
	try:
	audio_stream = (stream for stream in streams if stream.type == 'audio').next()
	except StopIteration:
	pass
	else:
	notification.center.remove_observer(self, sender=audio_stream)
	try:
	self.audio_conference.remove(audio_stream)
	except ValueError:
	# User may hangup before getting bridged into the conference
	pass
	if len(self.audio_conference.streams) == 0:
	self.moh_player.pause()
	self.audio_conference.hold()
	elif len(self.audio_conference.streams) == 1:
	self.moh_player.play()
	log.msg(u'Room %s - %s has removed audio' % (self.uri, format_identity(session.remote_identity)))
	self.dispatch_server_message('%s has removed audio' % format_identity(session.remote_identity), exclude=session)
	if not session.streams:
	log.msg(u'Room %s - %s has removed all streams, session will be terminated' % (self.uri, format_identity(session.remote_identity)))
	session.end()
	self.dispatch_conference_info()

	def _NH_SIPSessionTransferNewIncoming(self, notification):
	log.msg(u'Room %s - Call transfer request rejected, REFER must be out of dialog (RFC4579 5.5)' % self.uri)
	notification.sender.reject_transfer(403)

	@staticmethod
	def format_stream_types(streams):
	if not streams:
	return ''
	if len(streams) == 1:
	txt = 'with %s' % streams[0].type
	else:
	txt = 'with %s' % ','.join(stream.type for stream in streams[:-1])
	txt += ' and %s' % streams[-1:][0].type
	return txt

	@staticmethod
	def format_conference_stream_type(stream):
	if stream.type == 'chat':
	return 'message'
	return stream.type

	@staticmethod
	def format_session_duration(session):
	if session.start_time:
	duration = session.end_time - session.start_time
	seconds = duration.seconds if duration.microseconds < 500000 else duration.seconds+1
	minutes, seconds = seconds / 60, seconds % 60
	hours, minutes = minutes / 60, minutes % 60
	hours += duration.days*24
	if not minutes and not hours:
	duration_text = '%d seconds' % seconds
	elif not hours:
	duration_text = '%02d:%02d' % (minutes, seconds)
	else:
	duration_text = '%02d:%02d:%02d' % (hours, minutes, seconds)
	else:
	duration_text = '0s'
	return duration_text

	@staticmethod
	def format_file_size(size):
	infinite = float('infinity')
	boundaries = [( 1024, '%d bytes', 1),
	( 101024, '%.2f KB', 1024.0), ( 10241024, '%.1f KB', 1024.0),
	( 1010241024, '%.2f MB', 10241024.0), (102410241024, '%.1f MB', 10241024.0),
	(10102410241024, '%.2f GB', 102410241024.0), ( infinite, '%.1f GB', 10241024*1024.0)]
	for boundary, format, divisor in boundaries:
	if size < boundary:
	return format % (size/divisor,)
	else:
	return "%d bytes" % size


	class MoHPlayer(object):
	implements(IObserver)

	def __init__(self, conference):
	self.conference = conference
	self.files = None
	self.paused = None
	self._player = None

	def start(self):
	files = glob('%s/*.wav' % ResourcePath('sounds/moh').normalized)
	if not files:
	log.error(u'No files found, MoH is disabled')
	return
	random.shuffle(files)
	self.files = cycle(files)
	self._player = WavePlayer(SIPApplication.voice_audio_mixer, '', pause_time=1, initial_play=False, volume=20)
	self.paused = True
	self.conference.bridge.add(self._player)
	NotificationCenter().add_observer(self, sender=self._player)

	def stop(self):
	if self._player is None:
	return
	NotificationCenter().remove_observer(self, sender=self._player)
	self._player.stop()
	self.paused = True
	self.conference.bridge.remove(self._player)
	self.conference = None

	def play(self):
	if self._player is not None and self.paused:
	self.paused = False
	self._play_next_file()
	def pause(self):
	if self._player is not None and not self.paused:
	self.paused = True
	self._player.stop()

	def _play_next_file(self):
	self._player.filename = self.files.next()
	self._player.play()

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

	def _NH_WavePlayerDidFail(self, notification):
	if not self.paused:
	self._play_next_file()

	def _NH_WavePlayerDidEnd(self, notification):
	if not self.paused:
	self._play_next_file()


	class InterruptWelcome(Exception): pass

	class WelcomeHandler(object):
	implements(IObserver)

	def __init__(self, room, session):
	self.room = room
	self.session = session
	self.procs = proc.RunningProcSet()

	@run_in_green_thread
	def start(self, welcome_prompt=True):
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self.session)

	self.procs.spawn(self.play_audio_welcome, welcome_prompt)
	self.procs.spawn(self.render_chat_welcome, welcome_prompt)
	self.procs.waitall()

	notification_center.remove_observer(self, sender=self.session)
	self.session = None
	self.room = None

	def play_file_in_player(self, player, file, delay):
	player.filename = file
	player.pause_time = delay
	try:
	player.play().wait()
	except WavePlayerError, e:
	log.warning(u"Error playing file %s: %s" % (file, e))

	def play_audio_welcome(self, welcome_prompt):
	try:
	audio_stream = (stream for stream in self.session.streams if stream.type == 'audio').next()
	except StopIteration:
	return
	player = WavePlayer(audio_stream.mixer, '', pause_time=1, initial_play=False, volume=50)
	audio_stream.bridge.add(player)
	try:
	if welcome_prompt:
	file = ResourcePath('sounds/co_welcome_conference.wav').normalized
	self.play_file_in_player(player, file, 1)
	user_count = len(set(str(s.remote_identity.uri) for s in self.room.sessions if any(stream for stream in s.streams if stream.type == 'audio')) - set([str(self.session.remote_identity.uri)]))
	if user_count == 0:
	file = ResourcePath('sounds/co_only_one.wav').normalized
	self.play_file_in_player(player, file, 0.5)
	elif user_count == 1:
	file = ResourcePath('sounds/co_there_is.wav').normalized
	self.play_file_in_player(player, file, 0.5)
	elif user_count < 100:
	file = ResourcePath('sounds/co_there_are.wav').normalized
	self.play_file_in_player(player, file, 0.2)
	if user_count <= 24:
	file = ResourcePath('sounds/bi_%d.wav' % user_count).normalized
	self.play_file_in_player(player, file, 0.1)
	else:
	file = ResourcePath('sounds/bi_%d0.wav' % (user_count / 10)).normalized
	self.play_file_in_player(player, file, 0.1)
	file = ResourcePath('sounds/bi_%d.wav' % (user_count % 10)).normalized
	self.play_file_in_player(player, file, 0.1)
	file = ResourcePath('sounds/co_more_participants.wav').normalized
	self.play_file_in_player(player, file, 0)
	file = ResourcePath('sounds/connected_tone.wav').normalized
	self.play_file_in_player(player, file, 0.1)
	except InterruptWelcome:
	# No need to remove the bridge from the stream, it's done automatically
	pass
	else:
	audio_stream.bridge.remove(player)
	self.room.audio_conference.add(audio_stream)
	self.room.audio_conference.unhold()
	if len(self.room.audio_conference.streams) == 1:
	self.room.moh_player.play()
	else:
	self.room.moh_player.pause()
	finally:
	player.stop()

	def render_chat_welcome_prompt(self):
	txt = 'Welcome to the conference.'
	user_count = len(set(str(s.remote_identity.uri) for s in self.room.sessions) - set([str(self.session.remote_identity.uri)]))
	if user_count == 0:
	txt += ' You are the first participant in the room.'
	else:
	if user_count == 1:
	txt += ' There is one more participant in the room.'
	else:
	txt += ' There are %s more participants in the room.' % user_count
	return txt

	def render_chat_welcome(self, welcome_prompt):
	try:
	chat_stream = (stream for stream in self.session.streams if stream.type == 'chat').next()
	except StopIteration:
	return
	try:
	#welcome_prompt = self.render_chat_welcome_prompt()
	#chat_stream.send_message(welcome_prompt, 'text/plain', local_identity=self.room.identity, recipients=[self.room.identity])
	remote_identity = CPIMIdentity.parse(format_identity(self.session.remote_identity, cpim_format=True))
	for msg in database.get_last_messages(self.room.uri, ConferenceConfig.replay_history):
	recipient = CPIMIdentity.parse(msg.cpim_recipient)
	sender = CPIMIdentity.parse(msg.cpim_sender)
	if recipient.uri in (self.room.identity.uri, remote_identity.uri) or sender.uri == remote_identity.uri:
	chat_stream.send_message(msg.cpim_body, msg.cpim_content_type, local_identity=sender, recipients=[recipient], timestamp=msg.cpim_timestamp)
	except InterruptWelcome:
	pass

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

	def _NH_SIPSessionWillEnd(self, notification):
	self.procs.killall(InterruptWelcome)


	class RoomFile(object):

	def __init__(self, name, hash, size, sender, status):
	self.name = name
	self.hash = hash
	self.size = size
	self.sender = sender
	self.status = status

	@property
	def file_selector(self):
	return FileSelector.for_file(self.name.encode('utf-8'), hash=self.hash)


	class IncomingFileTransferHandler(object):
	implements(IObserver)

	def __init__(self, room, session):
	self.room = weakref.ref(room)
	self.room_uri = room.uri
	self.session = session
	self.stream = (stream for stream in self.session.streams if stream.type == 'file-transfer' and stream.direction == 'recvonly').next()
	self.error = False
	self.ended = False
	self.file = None
	self.file_selector = None
	self.filename = None
	self.hash = None
	self.status = None
	self.timer = None
	self.transfer_finished = False

	def start(self):
	self.file_selector = self.stream.file_selector
	path = os.path.join(ConferenceConfig.file_transfer_dir, self.room_uri)
	makedirs(path)
	self.filename = filename = os.path.join(path, self.file_selector.name.decode('utf-8'))
	basename, ext = os.path.splitext(filename)
	i = 1
	while os.path.exists(filename):
	filename = '%s_%d%s' % (basename, i, ext)
	i += 1
	self.filename = filename
	try:
	self.file = open(self.filename, 'wb')
	except EnvironmentError:
	log.msg('Room %s - cannot write destination filename: %s' % (self.room_uri, self.filename))
	self.session.end()
	return
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self)
	notification_center.add_observer(self, sender=self.session)
	notification_center.add_observer(self, sender=self.stream)
	self.hash = hashlib.sha1()

	@run_in_thread('file-transfer')
	def write_chunk(self, data):
	notification_center = NotificationCenter()
	if data is not None:
	try:
	self.file.write(data)
	except EnvironmentError, e:
	notification_center.post_notification('IncomingFileTransferHandlerGotError', sender=self, data=NotificationData(error=str(e)))
	else:
	self.hash.update(data)
	else:
	self.file.close()
	if self.error:
	notification_center.post_notification('IncomingFileTransferHandlerDidFail', sender=self)
	else:
	notification_center.post_notification('IncomingFileTransferHandlerDidEnd', sender=self)

	@run_in_thread('file-io')
	def remove_bogus_file(self, filename):
	try:
	os.unlink(filename)
	except OSError:
	pass

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

	def _NH_SIPSessionDidEnd(self, notification):
	self.ended = True
	if self.timer is not None and self.timer.active():
	self.timer.cancel()
	self.timer = None

	notification.center.remove_observer(self, sender=self.stream)
	notification.center.remove_observer(self, sender=self.session)

	# Mark end of write operation
	self.write_chunk(None)

	def _NH_FileTransferStreamGotChunk(self, notification):
	self.write_chunk(notification.data.content)

	def _NH_FileTransferStreamDidFinish(self, notification):
	self.transfer_finished = True
	if self.timer is None:
	self.timer = reactor.callLater(5, self.session.end)

	def _NH_IncomingFileTransferHandlerGotError(self, notification):
	log.error('Error while handling incoming file transfer: %s' % notification.data.error)
	self.error = True
	self.status = notification.data.error
	if not self.ended and self.timer is None:
	self.timer = reactor.callLater(5, self.session.end)

	def _NH_IncomingFileTransferHandlerDidEnd(self, notification):
	notification.center.remove_observer(self, sender=self)

	remote_hash = self.file_selector.hash
	if not self.transfer_finished:
	log.msg('File transfer of %s cancelled' % os.path.basename(self.filename))
	self.remove_bogus_file(self.filename)
	self.status = 'INCOMPLETE'
	else:
	local_hash = 'sha1:' + ':'.join(re.findall(r'..', self.hash.hexdigest().upper()))
	if local_hash != remote_hash:
	log.warning('Hash of transferred file does not match the remote hash (file may have changed).')
	self.status = 'Hash missmatch'
	self.remove_bogus_file(self.filename)
	else:
	self.status = 'OK'

	file = RoomFile(self.filename, remote_hash, self.file_selector.size, format_identity(self.session.remote_identity, cpim_format=True), self.status)
	room = self.room() or Null
	room.add_file(file)

	self.session = None
	self.stream = None

	def _NH_IncomingFileTransferHandlerDidFail(self, notification):
	notification.center.remove_observer(self, sender=self)

	file = RoomFile(self.filename, self.file_selector.hash, self.file_selector.size, format_identity(self.session.remote_identity, cpim_format=True), self.status)
	room = self.room() or Null
	room.add_file(file)

	self.session = None
	self.stream = None


	class OutgoingFileTransferRequestHandler(object):
	implements(IObserver)

	def __init__(self, room, session):
	self.room = weakref.ref(room)
	self.session = session
	self.stream = (stream for stream in self.session.streams if stream.type == 'file-transfer').next()
	self.timer = None

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

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

	def _NH_FileTransferStreamDidFinish(self, notification):
	if self.timer is None:
	self.timer = reactor.callLater(2, self.session.end)

	def _NH_SIPSessionDidEnd(self, notification):
	if self.timer is not None and self.timer.active():
	self.timer.cancel()
	self.timer = None
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=self.stream)
	notification_center.remove_observer(self, sender=self.session)
	self.session = None
	self.stream = None

	_NH_SIPSessionDidFail = _NH_SIPSessionDidEnd


	class InterruptFileTransfer(Exception): pass

	class OutgoingFileTransferHandler(object):
	implements(IObserver)

	def __init__(self, room, destination, file):
	self.room_uri = room.identity.uri
	self.destination = destination
	self.file = file
	self.session = None
	self.stream = None
	self.timer = None

	@run_in_green_thread
	def start(self):
	self.greenlet = api.getcurrent()
	settings = SIPSimpleSettings()
	account = AccountManager().sylkserver_account
	if account.sip.outbound_proxy is not None:
	uri = SIPURI(host=account.sip.outbound_proxy.host,
	port=account.sip.outbound_proxy.port,
	parameters={'transport': account.sip.outbound_proxy.transport})
	else:
	uri = SIPURI.new(self.destination)
	lookup = DNSLookup()
	try:
	routes = lookup.lookup_sip_proxy(uri, settings.sip.transport_list).wait()
	except DNSLookupError:
	return

	notification_center = NotificationCenter()
	self.session = Session(account)
	self.stream = FileTransferStream(self.file.file_selector, 'sendonly')
	notification_center.add_observer(self, sender=self.session)
	notification_center.add_observer(self, sender=self.stream)
	subject = u'File uploaded by %s' % self.file.sender
	from_header = FromHeader(SIPURI.new(self.room_uri), u'Conference File Transfer')
	to_header = ToHeader(SIPURI.new(self.destination))
	transport = routes[0].transport
	parameters = {} if transport=='udp' else {'transport': transport}
	contact_header = ContactHeader(SIPURI(user=self.room_uri.user, host=SIPConfig.local_ip.normalized, port=getattr(Engine(), '%s_port' % transport), parameters=parameters))
	extra_headers = []
	if ThorNodeConfig.enabled:
	extra_headers.append(Header('Thor-Scope', 'conference-invitation'))
	originator_uri = CPIMIdentity.parse(self.file.sender).uri
	extra_headers.append(Header('X-Originator-From', str(originator_uri)))
	self.session.connect(from_header, to_header, contact_header=contact_header, routes=routes, streams=[self.stream], is_focus=True, subject=subject, extra_headers=extra_headers)

	def stop(self):
	if self.session is not None:
	self.session.end()

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

	def _NH_FileTransferStreamDidFinish(self, notification):
	if self.timer is None:
	self.timer = reactor.callLater(2, self.session.end)

	def _NH_SIPSessionDidEnd(self, notification):
	if self.timer is not None and self.timer.active():
	self.timer.cancel()
	self.timer = None
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=self.stream)
	notification_center.remove_observer(self, sender=self.session)
	self.session = None
	self.stream = None

	_NH_SIPSessionDidFail = _NH_SIPSessionDidEnd

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