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	diff --git a/sip-audio-session3 b/sip-audio-session3
	index 3ea79b5..5161b02 100755
	--- a/sip-audio-session3
	+++ b/sip-audio-session3
	@@ -1,1639 +1,1639 @@
	#!/usr/bin/env python3

	import atexit
	import glob
	import os
	import platform
	import select
	import shutil
	import signal
	import re
	import sys
	import termios
	import uuid
	import subprocess

	from datetime import datetime
	from eventlib import api
	from itertools import chain
	from optparse import OptionParser
	from threading import Thread
	from time import sleep
	from lxml import html

	from application import log
	from application.notification import NotificationCenter, NotificationData
	from application.python import Null
	from application.process import process
	from application.python.queue import EventQueue
	from application.system import makedirs

	from gnutls.errors import GNUTLSError
	from gnutls.crypto import X509Certificate, X509PrivateKey

	from twisted.internet import reactor

	from pathlib import Path
	from sipsimple.account import Account, AccountManager, BonjourAccount
	from sipsimple.audio import WavePlayer
	from sipsimple.application import SIPApplication
	from sipsimple.configuration import ConfigurationError
	from sipsimple.configuration.settings import SIPSimpleSettings
	from sipsimple.core import Engine, SIPCoreError, SIPURI, ToHeader, Header, CORE_REVISION, PJ_VERSION, PJ_SVN_REVISION
	from sipsimple import __version__ as version
	from sipsimple.lookup import DNSLookup
	from sipsimple.session import Session
	from sipsimple.streams import MediaStreamRegistry
	from sipsimple.storage import FileStorage

	from sipclient.configuration import config_directory
	from sipclient.configuration.account import AccountExtension, BonjourAccountExtension
	from sipclient.configuration.datatypes import ResourcePath
	from sipclient.configuration.settings import SIPSimpleSettingsExtension
	from sipclient.log import Logger
	from sipclient.system import IPAddressMonitor, copy_default_certificates


	class BonjourNeighbour(object):
	def __init__(self, neighbour, uri, display_name, host):
	self.display_name = display_name
	self.host = host
	self.neighbour = neighbour
	self.uri = uri


	class InputThread(Thread):
	def __init__(self):
	Thread.__init__(self)
	self.setDaemon(True)
	self._old_terminal_settings = None

	def start(self):
	atexit.register(self._termios_restore)
	Thread.start(self)

	def run(self):
	notification_center = NotificationCenter()
	while True:
	chars = list(self._getchars())
	while chars:
	char = chars.pop(0)
	if char == '\x1b': # escape
	if len(chars) >= 2 and chars[0] == '[' and chars[1] in ('A', 'B', 'C', 'D'): # one of the arrow keys
	char = char + chars.pop(0) + chars.pop(0)
	notification_center.post_notification('SIPApplicationGotInput', sender=self, data=NotificationData(input=char))

	def stop(self):
	self._termios_restore()

	def _termios_restore(self):
	if self._old_terminal_settings is not None:
	termios.tcsetattr(sys.stdin.fileno(), termios.TCSADRAIN, self._old_terminal_settings)

	def _getchars(self):
	fd = sys.stdin.fileno()
	if os.isatty(fd):
	self._old_terminal_settings = termios.tcgetattr(fd)
	new = termios.tcgetattr(fd)
	new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
	new[6][termios.VMIN] = b'\000'
	try:
	termios.tcsetattr(fd, termios.TCSADRAIN, new)
	if select.select([fd], [], [], None)[0]:
	return sys.stdin.read(4192)
	finally:
	self._termios_restore()
	else:
	return os.read(fd, 4192)


	class RTPStatisticsThread(Thread):
	def __init__(self, application):
	Thread.__init__(self)
	self.setDaemon(True)
	self.application = application
	self.stopped = False

	def run(self):
	notification_center = NotificationCenter()
	last_active_session = None
	while not self.stopped:
	if self.application.active_session is not None and self.application.active_session.streams:
	if last_active_session != self.application.active_session:
	last_rx_packets = 0
	lost_rtp_count = 0
	last_active_session = self.application.active_session
	audio_stream = self.application.active_session.streams[0]
	stats = audio_stream.statistics
	if stats is not None:
	rx_packets = stats['rx']['packets'] - last_rx_packets
	last_rx_packets = stats['rx']['packets']
	if rx_packets == 0:
	lost_rtp_count = lost_rtp_count + 1
	else:
	lost_rtp_count = 0

	if lost_rtp_count:
	notification_center.post_notification('RTPWasLost', sender=self.application.active_session, data=NotificationData(count=lost_rtp_count))

	msg = '%s RTP audio statistics: RTT=%d ms, packet loss=%.1f%%, jitter RX/TX=%d/%d ms\n' % (datetime.now().replace(microsecond=0), stats['rtt']['avg'] / 1000, 100.0 * stats['rx']['packets_lost'] / stats['rx']['packets'] if stats['rx']['packets'] else 0, stats['rx']['jitter']['avg'] / 1000, stats['tx']['jitter']['avg'] / 1000)
	notification_center.post_notification('RTPStatisticsLog', sender=self.application.active_session, data=NotificationData(line=msg))

	try:
	video_stream = self.application.active_session.streams[1]
	except IndexError:
	pass
	else:
	stats = video_stream.statistics
	if stats is not None:
	msg = '%s RTP video statistics: RTT=%d ms, packet loss=%.1f%%, jitter RX/TX=%d/%d ms\n' % (datetime.now().replace(microsecond=0), stats['rtt']['avg'] / 1000, 100.0 * stats['rx']['packets_lost'] / stats['rx']['packets'] if stats['rx']['packets'] else 0, stats['rx']['jitter']['avg'] / 1000, stats['tx']['jitter']['avg'] / 1000)
	notification_center.post_notification('RTPStatisticsLog', sender=self.application.active_session, data=NotificationData(line=msg))
	sleep(5)

	def stop(self):
	self.stopped = True


	class CancelThread(Thread):
	def __init__(self, application):
	Thread.__init__(self)
	self.setDaemon(True)
	self.application = application
	self.stopped = False

	def run(self):
	while not self.stopped:
	self.application.end_session_if_needed()
	self.application.stop_if_needed()
	sleep(1)

	def stop(self):
	self.stopped = True


	class SIPAudioApplication(SIPApplication):

	def __init__(self):
	self.account = None
	self.options = None
	self.target = None

	self.active_session = None
	self.answer_timers = {}
	self.hangup_timers = {}
	self.started_sessions = []
	self.incoming_sessions = []
	self.outgoing_session = None
	self.neighbours = {}
	self.registration_succeeded = False
	self.success = False

	self.input = None
	self.output = None
	self.ip_address_monitor = IPAddressMonitor()
	self.logger = None
	self.rtp_statistics = None

	self.alert_tone_generator = None
	self.voice_tone_generator = None
	self.wave_inbound_ringtone = None
	self.wave_outbound_ringtone = None
	self.tone_ringtone = None
	self.hold_tone = None

	self.ignore_local_hold = False
	self.ignore_local_unhold = False

	self.batch_mode = False
	self.stop_call_thread = None
	self.session_spool_dir = None
	self.play_file = None
	self.playback_wave_player = None
	self.disable_ringtone = False
	self.disable_hanguptone = False

	self.enable_playback = False
	self.play_failure_code = False
	self.rtp_lost = False
	self.show_rtp_statistics = False

	def _write(self, message):
	sys.stdout.write(message)
	sys.stdout.flush()

	def start(self, target, options):
	notification_center = NotificationCenter()

	if options.daemonize:
	process.daemonize()

	self.options = options
	self.target = target
	self.auto_reconnect = options.auto_reconnect
	self.batch_mode = options.batch_mode
	self.enable_video = options.enable_video
	self.log_register = options.log_register
	self.play_failure_code = options.play_failure_code
	self.input = InputThread() if not self.batch_mode else None
	self.output = EventQueue(self._write)
	self.logger = Logger(sip_to_stdout=options.trace_sip, pjsip_to_stdout=options.trace_pjsip, notifications_to_stdout=options.trace_notifications)

	notification_center.add_observer(self, sender=self)
	notification_center.add_observer(self, sender=self.input)
	notification_center.add_observer(self, name='SIPSessionNewIncoming')
	notification_center.add_observer(self, name='RTPStreamDidChangeRTPParameters')
	notification_center.add_observer(self, name='RTPStreamICENegotiationDidSucceed')
	notification_center.add_observer(self, name='RTPStreamICENegotiationDidFail')
	notification_center.add_observer(self, name='RTPStreamICENegotiationStateDidChange')
	notification_center.add_observer(self, name='SIPSessionGotConferenceInfo')
	notification_center.add_observer(self, name='TLSTransportHasChanged')
	notification_center.add_observer(self, name='MediaStreamDidStart')
	notification_center.add_observer(self, name='SessionMustReconnect')

	if self.input:
	self.input.start()
	self.output.start()

	log.level.current = log.level.WARNING # get rid of twisted messages

	Account.register_extension(AccountExtension)
	BonjourAccount.register_extension(BonjourAccountExtension)
	SIPSimpleSettings.register_extension(SIPSimpleSettingsExtension)

	self.config_directory = options.config_directory or config_directory
	self.disable_ringtone = options.disable_ringtone
	self.disable_hanguptone = options.disable_hanguptone
	self.auto_record = options.auto_record

	try:
	self.output.put("Using config directory: %s\n" % self.config_directory)
	SIPApplication.start(self, FileStorage(self.config_directory))
	except ConfigurationError as e:
	self.output.put("Failed to load sipclient's configuration: %s\n" % str(e))
	self.output.put("If an old configuration file is in place, delete it or move it and recreate the configuration using the sip_settings script.\n")
	self.output.stop()
	else:
	self.output.put("SDK version %s, core version %s, PJSIP version %s (%s)\n" % (version, CORE_REVISION, PJ_VERSION.decode(), PJ_SVN_REVISION))

	if options.spool_dir:
	self.spool_dir = options.spool_dir
	else:
	self.spool_dir = "%s/spool/sesssions" % self.config_directory

	try:
	makedirs(self.spool_dir)
	except Exception as e:
	log.error('Failed to create spool directory at {directory}: {exception!s}'.format(directory=self.spool_dir, exception=e))
	else:
	self.output.put("Using spool directory %s\n" % self.spool_dir)

	stop_app_file = "%s/stop" % self.spool_dir
	if os.path.exists(stop_app_file):
	os.remove(stop_app_file)

	self.output.put("To stop the app: touch %s\n" % stop_app_file)

	self.scripts_dir = "%s/scripts" % self.config_directory
	try:
	makedirs(self.scripts_dir)
	except Exception as e:
	log.error('Failed to create scripts directory at {directory}: {exception!s}'.format(directory=dir, exception=e))

	self.enable_playback = options.enable_playback
	if options.playback_dir:
	self.playback_dir = options.playback_dir
	else:
	self.playback_dir = "%s/spool/playback" % self.config_directory
	makedirs(self.playback_dir)

	self._remove_lock()

	if self.enable_playback:
	self.playback_queue = EventQueue(self._handle_outgoing_playback)

	active_playback_dir = self.playback_dir + '/active'
	makedirs(active_playback_dir)

	scripts_playback_dir = self.playback_dir + '/scripts'
	makedirs(scripts_playback_dir)

	def poll_playback_directory(self):
	if self.outgoing_session:
	reactor.callLater(0.2, self.poll_playback_directory)
	return

	files = list(filter(os.path.isfile, glob.glob(self.playback_dir + "/*.wav")))
	files.sort(key=lambda x: os.path.getmtime(x))
	for file in files:
	if len(file.split('@')) == 2:
	active_playback_dir = self.playback_dir + '/active'
	basename = os.path.basename(file)
	self.output.put("Audio recording detected: %s\n" % file)
	filename = '%s/%s-%s' % (active_playback_dir, datetime.now().strftime("%Y%m%d-%H%M%S"), basename)
	os.replace(file, filename)
	play_object = {'target': os.path.splitext(basename)[0],
	'filename': filename}
	self.playback_queue.put(play_object)

	reactor.callLater(0.2, self.poll_playback_directory)

	def _handle_outgoing_playback(self, play_object):
	self.play_file = play_object['filename']
	self.start_outgoing_call(play_object['target'])

	def print_help(self):
	message = 'Available control keys:\n'
	message += ' s: toggle SIP trace on the console\n'
	message += ' j: toggle PJSIP trace on the console\n'
	message += ' n: toggle notifications trace on the console\n'
	message += ' p: toggle printing RTP statistics on the console\n'
	message += ' h: hang-up the active session\n'
	message += ' r: toggle audio recording\n'
	message += ' m: mute the microphone\n'
	message += ' i: change audio input device\n'
	message += ' o: change audio output device\n'
	message += ' a: change audio alert device\n'
	message += ' SPACE: hold/unhold\n'
	message += ' Ctrl-d: quit the program\n'
	message += ' ?: display this help message\n'
	self.output.put('\n'+message+'\n')

	def _NH_SIPApplicationWillStart(self, notification):
	account_manager = AccountManager()
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()

	#if 'armv7' in platform.platform() and settings.audio.echo_canceller.enabled:
	# self.output.put("Disable echo canceller on ARM architecture\n")
	# settings.audio.echo_canceller.enabled = False
	# settings.save()

	for account in account_manager.iter_accounts():
	if isinstance(account, Account):
	account.sip.register = False
	account.presence.enabled = False
	account.xcap.enabled = False
	account.message_summary.enabled = False

	if self.options.account is None:
	self.account = account_manager.default_account
	else:
	possible_accounts = [account for account in account_manager.iter_accounts() if self.options.account in account.id and account.enabled]
	if len(possible_accounts) > 1:
	self.output.put('More than one account exists which matches %s: %s\n' % (self.options.account, ', '.join(sorted(account.id for account in possible_accounts))))
	self.output.stop()
	self.stop()
	self.end_cancel_thread()
	return
	elif len(possible_accounts) == 0:
	self.output.put('No enabled account that matches %s was found. Available and enabled accounts: %s\n' % (self.options.account, ', '.join(sorted(account.id for account in account_manager.get_accounts() if account.enabled))))
	self.output.stop()
	self.stop()
	self.end_cancel_thread()
	return
	else:
	self.account = possible_accounts[0]
	notification_center.add_observer(self, sender=self.account)

	if isinstance(self.account, Account) and self.target is None:
	self.account.sip.register = True
	self.account.presence.enabled = False
	self.account.xcap.enabled = False
	self.account.message_summary.enabled = False
	self.output.put('Using account %s\n' % self.account.id)

	self.logger.start()
	if settings.logs.trace_sip and self.logger._siptrace_filename is not None:
	self.output.put('Logging SIP trace to file "%s"\n' % self.logger._siptrace_filename)
	if settings.logs.trace_pjsip and self.logger._pjsiptrace_filename is not None:
	self.output.put('Logging PJSIP trace to file "%s"\n' % self.logger._pjsiptrace_filename)
	if settings.logs.trace_notifications and self.logger._notifications_filename is not None:
	self.output.put('Logging notifications trace to file "%s"\n' % self.logger._notifications_filename)

	if self.options.disable_sound:
	settings.audio.input_device = None
	settings.audio.output_device = None
	settings.audio.alert_device = None

	if self.options.enable_default_devices:
	settings.audio.input_device = 'system_default'
	settings.audio.output_device = 'system_default'
	settings.audio.alert_device = 'system_default'

	def handle_notification(self, notification):
	alive_file = os.path.join(self.config_directory, 'last_notification')
	Path(alive_file).touch()

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

	def _NH_SIPApplicationDidStart(self, notification):
	engine = Engine()
	settings = SIPSimpleSettings()

	self.rtp_statistics = RTPStatisticsThread(self)
	self.rtp_statistics.start()

	engine.trace_sip = self.logger.sip_to_stdout or settings.logs.trace_sip
	engine.log_level = settings.logs.pjsip_level if (self.logger.pjsip_to_stdout or settings.logs.trace_pjsip) else 0

	self.ip_address_monitor.start()

	if self.enable_playback:
	self.output.put("Polling %s for wav files\n" % self.playback_dir)
	self.playback_queue.start()
	reactor.callLater(3, self.poll_playback_directory)

	self.output.put('Available audio input devices: %s\n' % ', '.join(['None', 'system_default'] + sorted(engine.input_devices)))
	self.output.put('Available audio output devices: %s\n' % ', '.join(['None', 'system_default'] + sorted(engine.output_devices)))
	self.output.put('Available audio codecs: %s\n' % ', '.join([codec.decode() for codec in engine._ua.available_codecs]))
	self.output.put('Available video codecs: %s\n' % ', '.join([codec.decode() for codec in engine._ua.available_video_codecs]))

	if engine.video_devices:
	self.output.put('Available cameras: %s\n' % ', '.join(sorted(engine.video_devices)))

	if self.enable_video:
	self.output.put('No camera present, video is disabled')
	self.enable_video = False

	if self.voice_audio_mixer.input_device == 'system_default':
	self.output.put('Using audio input device: %s (system default device)\n' % self.voice_audio_mixer.real_input_device)
	else:
	self.output.put('Using audio input device: %s\n' % self.voice_audio_mixer.input_device)
	if self.voice_audio_mixer.output_device == 'system_default':
	self.output.put('Using audio output device: %s (system default device)\n' % self.voice_audio_mixer.real_output_device)
	else:
	self.output.put('Using audio output device: %s\n' % self.voice_audio_mixer.output_device)
	if self.alert_audio_mixer.output_device == 'system_default':
	self.output.put('Using audio alert device: %s (system default device)\n' % self.alert_audio_mixer.real_output_device)
	else:
	self.output.put('Using audio alert device: %s\n' % self.alert_audio_mixer.output_device)

	if not self.batch_mode and not self.disable_ringtone:
	self.print_help()

	inbound_ringtone = self.account.sounds.audio_inbound.sound_file if self.account.sounds.audio_inbound is not None else None
	outbound_ringtone = settings.sounds.audio_outbound
	if inbound_ringtone:
	self.wave_inbound_ringtone = WavePlayer(self.alert_audio_mixer, inbound_ringtone.path.normalized, volume=inbound_ringtone.volume, loop_count=0, pause_time=2)
	self.alert_audio_bridge.add(self.wave_inbound_ringtone)

	if not self.disable_ringtone:
	if outbound_ringtone:
	self.wave_outbound_ringtone = WavePlayer(self.voice_audio_mixer, outbound_ringtone.path.normalized, volume=outbound_ringtone.volume, loop_count=0, pause_time=2)
	self.voice_audio_bridge.add(self.wave_outbound_ringtone)
	self.tone_ringtone = WavePlayer(self.voice_audio_mixer, ResourcePath('sounds/ring_tone.wav').normalized, loop_count=0, pause_time=6)
	self.voice_audio_bridge.add(self.tone_ringtone)
	self.hold_tone = WavePlayer(self.voice_audio_mixer, ResourcePath('sounds/hold_tone.wav').normalized, loop_count=0, pause_time=30, volume=50)
	self.voice_audio_bridge.add(self.hold_tone)

	if settings.tls.ca_list is None:
	copy_default_certificates()
	self.output.put('Initializing default TLS certificates and settings')
	settings.tls.ca_list = os.path.join(config_directory, 'tls/ca.crt')
	settings.tls.certificate = os.path.join(config_directory, 'tls/default.crt')
	settings.tls.verify_server = True
	settings.save()

	if self.options.mute:
	self.output.put('Mute microphone at start\n')
	self.voice_audio_mixer.muted = True

	if self.target is not None:
	self.start_outgoing_call(target)

	def _NH_SessionMustReconnect(self, notification):
	self.output.put('Reconnecting session to %s\n' % notification.data.target)
	self.start_outgoing_call(notification.data.target)

	def start_outgoing_call(self, target):
	self.target = target

	if isinstance(self.account, BonjourAccount) and '@' not in self.target:
	self.output.put('Bonjour mode requires a host in the destination address\n')
	if not self.enable_playback:
	self.stop()
	self.end_cancel_thread()
	return

	if self.play_file:
	lock_file = "%s/playback.lock" % self.playback_dir
	Path(lock_file).touch()
	#self.output.put("Lock file %s created\n" % lock_file)

	if '@' not in self.target:
	self.target = '%s@%s' % (self.target, self.account.id.domain)
	if not self.target.startswith('sip:') and not self.target.startswith('sips:'):
	self.target = 'sip:' + self.target
	try:
	self.target = SIPURI.parse(self.target)
	except SIPCoreError:
	self.output.put('Illegal SIP URI: %s\n' % self.target)
	if not self.enable_playback:
	self.stop()
	else:
	if '.' not in self.target.host.decode() and not isinstance(self.account, BonjourAccount):
	self.target.host = '%s.%s' % (self.target.host, self.account.id.domain)
	lookup = DNSLookup()
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()
	notification_center.add_observer(self, sender=lookup)

	self.session_spool_dir = self.spool_dir + "/" + (self.options.external_id or str(uuid.uuid1()))

	if isinstance(self.account, Account) and self.account.sip.outbound_proxy is not None:
	uri = SIPURI(host=self.account.sip.outbound_proxy.host, port=self.account.sip.outbound_proxy.port, parameters={'transport': self.account.sip.outbound_proxy.transport})
	tls_name = self.account.sip.tls_name or self.account.sip.outbound_proxy.host
	elif isinstance(self.account, Account) and self.account.sip.always_use_my_proxy:
	uri = SIPURI(host=self.account.id.domain)
	tls_name = self.account.sip.tls_name or self.account.id.domain
	else:
	uri = self.target
	tls_name = uri.host
	if self.account is not BonjourAccount():
	if self.account.id.domain == uri.host.decode():
	tls_name = self.account.sip.tls_name or self.account.id.domain
	elif "isfocus" in str(uri) and uri.host.decode().endswith(self.account.id.domain):
	tls_name = self.account.conference.tls_name or self.account.sip.tls_name or self.account.id.domain
	else:
	is_ip_address = re.match("^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$", uri.host.decode()) or ":" in uri.host.decode()
	if "isfocus" in str(uri) and self.account.conference.tls_name:
	tls_name = self.account.conference.tls_name
	elif is_ip_address and self.account.sip.tls_name:
	tls_name = self.account.sip.tls_name

	#self.output.put('DNS lookup for %s\n' % uri)

	lookup.lookup_sip_proxy(uri, settings.sip.transport_list, tls_name=tls_name)

	try:
	makedirs(self.session_spool_dir)
	except Exception as e:
	log.error('Failed to create session spool directory at {directory}: {exception!s}'.format(directory=self.session_spool_dir, exception=e))
	else:
	if self.stop_call_thread is None:
	self.stop_call_thread = CancelThread(self)
	self.stop_call_thread.start()
	self.output.put("To stop the call: touch %s/stop\n" % self.session_spool_dir)

	def _NH_SIPApplicationWillEnd(self, notification):
	if isinstance(self.account, Account):
	self.account.sip.register = False
	self.ip_address_monitor.stop()

	def _NH_SIPApplicationDidEnd(self, notification):
	if self.input:
	self.input.stop()
	self.output.stop()
	self.output.join()

	def _NH_SIPEngineDetectedNATType(self, notification):
	SIPApplication._NH_SIPEngineDetectedNATType(self, notification)
	if notification.data.succeeded:
	self.output.put('Detected NAT type: %s\n' % notification.data.nat_type)

	def _NH_SIPApplicationGotInput(self, notification):
	engine = Engine()
	notification_center = NotificationCenter()
	settings = SIPSimpleSettings()
	if notification.data.input == '\x04':
	if self.active_session is not None:
	self.output.put('Ending audio session...\n')
	self.active_session.end()
	elif self.outgoing_session is not None:
	self.output.put('Cancelling audio session...\n')
	self.outgoing_session.end()
	else:
	self.stop()
	self.end_cancel_thread()
	elif notification.data.input == '?':
	self.print_help()
	elif notification.data.input in ('y', 'n') and self.incoming_sessions:
	accepted_types = ['video', 'audio', 'chat'] if self.enable_video else ['audio', 'chat']
	session = self.incoming_sessions.pop(0)
	if notification.data.input == 'y':
	session.accept([stream for stream in session.proposed_streams if stream.type in accepted_types])
	else:
	session.reject()
	elif notification.data.input == 'm':
	self.voice_audio_mixer.muted = not self.voice_audio_mixer.muted
	self.output.put('The microphone is now %s\n' % ('muted' if self.voice_audio_mixer.muted else 'unmuted'))
	elif notification.data.input == 'i':
	input_devices = [None, 'system_default'] + sorted(engine.input_devices)
	if self.voice_audio_mixer.input_device in input_devices:
	old_input_device = self.voice_audio_mixer.input_device
	else:
	old_input_device = None
	tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
	new_input_device = input_devices[(input_devices.index(old_input_device)+1) % len(input_devices)]
	try:
	self.voice_audio_mixer.set_sound_devices(new_input_device, self.voice_audio_mixer.output_device, tail_length)
	except SIPCoreError as e:
	self.output.put('Failed to set input device to %s: %s\n' % (new_input_device, str(e)))
	else:
	if new_input_device == 'system_default':
	self.output.put('Audio input device changed to %s (system default device)\n' % self.voice_audio_mixer.real_input_device)
	else:
	self.output.put('Audio input device changed to %s\n' % new_input_device)
	elif notification.data.input == 'o':
	output_devices = [None, 'system_default'] + sorted(engine.output_devices)
	if self.voice_audio_mixer.output_device in output_devices:
	old_output_device = self.voice_audio_mixer.output_device
	else:
	old_output_device = None
	tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
	new_output_device = output_devices[(output_devices.index(old_output_device)+1) % len(output_devices)]
	try:
	self.voice_audio_mixer.set_sound_devices(self.voice_audio_mixer.input_device, new_output_device, tail_length)
	except SIPCoreError as e:
	self.output.put('Failed to set output device to %s: %s\n' % (new_output_device, str(e)))
	else:
	if new_output_device == 'system_default':
	self.output.put('Audio output device changed to %s (system default device)\n' % self.voice_audio_mixer.real_output_device)
	else:
	self.output.put('Audio output device changed to %s\n' % new_output_device)
	elif notification.data.input == 'a':
	output_devices = [None, 'system_default'] + sorted(engine.output_devices)
	if self.alert_audio_mixer.output_device in output_devices:
	old_output_device = self.alert_audio_mixer.output_device
	else:
	old_output_device = None
	tail_length = settings.audio.echo_canceller.tail_length if settings.audio.echo_canceller.enabled else 0
	new_output_device = output_devices[(output_devices.index(old_output_device)+1) % len(output_devices)]
	try:
	self.alert_audio_mixer.set_sound_devices(self.alert_audio_mixer.input_device, new_output_device, tail_length)
	except SIPCoreError as e:
	self.output.put('Failed to set alert device to %s: %s\n' % (new_output_device, str(e)))
	else:
	if new_output_device == 'system_default':
	self.output.put('Audio alert device changed to %s (system default device)\n' % self.alert_audio_mixer.real_output_device)
	else:
	self.output.put('Audio alert device changed to %s\n' % new_output_device)
	elif notification.data.input == 'h':
	if self.active_session is not None:
	self.output.put('Ending audio session...\n')
	self.active_session.end()
	elif self.outgoing_session is not None:
	self.output.put('Cancelling audio session...\n')
	self.outgoing_session.end()
	elif notification.data.input == ' ':
	if self.active_session is not None:
	if self.active_session.on_hold:
	self.active_session.unhold()
	else:
	self.active_session.hold()
	elif notification.data.input in ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '*', '#', 'A', 'B', 'C', 'D'):
	if self.active_session is not None:
	try:
	audio_stream = self.active_session.streams[0]
	except IndexError:
	pass
	else:
	digit = notification.data.input
	filename = 'sounds/dtmf_%s_tone.wav' % {'*': 'star', '#': 'pound'}.get(digit, digit)
	wave_player = WavePlayer(self.voice_audio_mixer, ResourcePath(filename).normalized)
	notification_center.add_observer(self, sender=wave_player)
	audio_stream.send_dtmf(digit)
	if self.active_session.account.rtp.inband_dtmf:
	audio_stream.bridge.add(wave_player)
	self.voice_audio_bridge.add(wave_player)
	wave_player.start()
	elif notification.data.input in ('\x1b[A', '\x1b[D') and len(self.started_sessions) > 0: # UP and LEFT
	if self.active_session is None:
	self.active_session = self.started_sessions[0]
	self.active_session.unhold()
	self.ignore_local_unhold = True
	elif len(self.started_sessions) > 1:
	self.active_session.hold()
	self.active_session = self.started_sessions[self.started_sessions.index(self.active_session)-1]
	self.active_session.unhold()
	self.ignore_local_unhold = True
	else:
	return
	identity = str(self.active_session.remote_identity.uri)
	if self.active_session.remote_identity.display_name:
	identity = '"%s" <%s>' % (self.active_session.remote_identity.display_name, identity)
	self.output.put('Active audio session: "%s" (%d/%d)\n' % (identity, self.started_sessions.index(self.active_session)+1, len(self.started_sessions)))
	elif notification.data.input in ('\x1b[B', '\x1b[C') and len(self.started_sessions) > 0: # DOWN and RIGHT
	if self.active_session is None:
	self.active_session = self.started_sessions[0]
	self.active_session.unhold()
	self.ignore_local_unhold = True
	elif len(self.started_sessions) > 1:
	self.active_session.hold()
	self.active_session = self.started_sessions[(self.started_sessions.index(self.active_session)+1) % len(self.started_sessions)]
	self.active_session.unhold()
	self.ignore_local_unhold = True
	else:
	return
	identity = str(self.active_session.remote_identity.uri)
	if self.active_session.remote_identity.display_name:
	identity = '"%s" <%s>' % (self.active_session.remote_identity.display_name, identity)
	self.output.put('Active audio session: "%s" (%d/%d)\n' % (identity, self.started_sessions.index(self.active_session)+1, len(self.started_sessions)))
	elif notification.data.input == 'r':
	if self.active_session is None or not self.active_session.streams:
	return
	session = self.active_session
	audio_stream = self.active_session.streams[0]
	if audio_stream.recorder is not None:
	audio_stream.stop_recording()
	else:
	direction = session.direction
	remote = "%s@%s" % (session.remote_identity.uri.user, session.remote_identity.uri.host)
	filename = "%s-%s-%s.wav" % (datetime.now().strftime("%Y%m%d-%H%M%S"), remote, direction)
	path = os.path.join(settings.audio.directory.normalized, session.account.id, datetime.now().strftime("%Y%m%d"))
	makedirs(path)
	audio_stream.start_recording(os.path.join(path, filename))
	elif notification.data.input == 'p':
	self.show_rtp_statistics = not self.show_rtp_statistics
	if self.show_rtp_statistics:
	self.output.put('Output of RTP statistics on console is now activated\n')
	else:
	self.output.put('Output of RTP statistics on console is now dectivated\n')
	elif notification.data.input == 'j':
	self.logger.pjsip_to_stdout = not self.logger.pjsip_to_stdout
	engine.log_level = settings.logs.pjsip_level if (self.logger.pjsip_to_stdout or settings.logs.trace_pjsip) else 0
	self.output.put('PJSIP tracing to console is now %s\n' % ('activated' if self.logger.pjsip_to_stdout else 'deactivated'))
	elif notification.data.input == 'n':
	self.logger.notifications_to_stdout = not self.logger.notifications_to_stdout
	self.output.put('Notification tracing to console is now %s.\n' % ('activated' if self.logger.notifications_to_stdout else 'deactivated'))
	elif notification.data.input == 's':
	self.logger.sip_to_stdout = not self.logger.sip_to_stdout
	engine.trace_sip = self.logger.sip_to_stdout or settings.logs.trace_sip
	self.output.put('SIP tracing to console is now %s\n' % ('activated' if self.logger.sip_to_stdout else 'deactivated'))

	def _NH_SIPEngineGotException(self, notification):
	self.output.put('An exception occured within the SIP core:\n%s\n' % notification.data.traceback)

	def _NH_SIPAccountRegistrationDidSucceed(self, notification):
	if self.registration_succeeded:
	return
	contact_header = notification.data.contact_header
	contact_header_list = notification.data.contact_header_list
	expires = notification.data.expires
	registrar = notification.data.registrar
	if self.log_register:
	message = '%s Registered contact "%s" for sip:%s at %s:%d;transport=%s (expires in %d seconds).\n' % (datetime.now().replace(microsecond=0), contact_header.uri, self.account.id, registrar.address, registrar.port, registrar.transport, expires)
	if len(contact_header_list) > 1:
	message += 'Other registered contacts:\n%s\n' % '\n'.join([' %s (expires in %s seconds)' % (str(other_contact_header.uri), other_contact_header.expires) for other_contact_header in contact_header_list if other_contact_header.uri != notification.data.contact_header.uri])
	self.output.put(message)

	self.registration_succeeded = True

	def _NH_SIPAccountRegistrationDidFail(self, notification):
	if self.log_register:
	self.output.put('%s Failed to register contact for sip:%s: %s (retrying in %.2f seconds)\n' % (datetime.now().replace(microsecond=0), self.account.id, notification.data.error, notification.data.retry_after))
	self.registration_succeeded = False

	def _NH_SIPAccountRegistrationDidEnd(self, notification):
	if self.log_register:
	self.output.put('%s Registration ended.\n' % datetime.now().replace(microsecond=0))

	def _NH_BonjourAccountRegistrationDidSucceed(self, notification):
	if self.log_register:
	self.output.put('%s Registered Bonjour contact %s\n' % (datetime.now().replace(microsecond=0), notification.data.name))

	def _NH_BonjourAccountRegistrationDidFail(self, notification):
	pass
	#self.output.put('%s Failed to register Bonjour contact: %s\n' % (datetime.now().replace(microsecond=0), notification.data.reason))

	def _NH_BonjourAccountRegistrationDidEnd(self, notification):
	if self.log_register:
	self.output.put('%s Registration ended.\n' % datetime.now().replace(microsecond=0))

	def _NH_BonjourAccountDidAddNeighbour(self, notification):
	neighbour, record = notification.data.neighbour, notification.data.record
	now = datetime.now().replace(microsecond=0)
	self.output.put('%s Bonjour neighbour joined: %s (%s) <%s>\n' % (now, record.name, record.host, record.uri))
	self.neighbours[neighbour] = BonjourNeighbour(neighbour, record.uri, record.name, record.host)

	def _NH_BonjourAccountDidUpdateNeighbour(self, notification):
	neighbour, record = notification.data.neighbour, notification.data.record
	now = datetime.now().replace(microsecond=0)
	try:
	bonjour_neighbour = self.neighbours[neighbour]
	except KeyError:
	self.output.put('%s Bonjour neighbour joined: "%s (%s)" <%s>\n' % (now, record.name, record.host, record.uri))
	self.neighbours[neighbour] = BonjourNeighbour(neighbour, record.uri, record.name, record.host)
	else:
	self.output.put('%s Bonjour neighbour updated: "%s (%s)" <%s>\n' % (now, record.name, record.host, record.uri))
	bonjour_neighbour.display_name = record.name
	bonjour_neighbour.host = record.host
	bonjour_neighbour.uri = record.uri

	def _NH_BonjourAccountDidRemoveNeighbour(self, notification):
	neighbour = notification.data.neighbour
	now = datetime.now().replace(microsecond=0)
	try:
	bonjour_neighbour = self.neighbours.pop(neighbour)
	except KeyError:
	pass
	else:
	self.output.put('%s Bonjour neighbour left: "%s (%s)" <%s>\n' % (now, bonjour_neighbour.display_name, bonjour_neighbour.host, bonjour_neighbour.uri))

	def _NH_DNSLookupDidSucceed(self, notification):
	notification_center = NotificationCenter()

	results = ('%s:%s (%s)' % (result.address, result.port, result.transport.upper()) for result in notification.data.result)
	result_text = ', '.join(results)

	self.output.put("\nDNS lookup for %s succeeded: %s\n" % (self.target.host.decode(), result_text))

	if self.end_session_if_needed():
	self.stop()
	self.end_cancel_thread()

	self.outgoing_session = session = Session(self.account)
	notification_center.add_observer(self, sender=session)
	streams = [MediaStreamRegistry.AudioStream(), MediaStreamRegistry.VideoStream()] if self.enable_video else [MediaStreamRegistry.AudioStream()]
	session.connect(ToHeader(self.target), routes=notification.data.result, streams=streams)

	def _NH_DNSLookupDidFail(self, notification):
	self.output.put('DNS lookup failed: %s\n' % notification.data.error)

	self._playback_end(failed_reason='outgoing-failed-DNS')

	if not self.enable_playback and not self.options.auto_reconnect:
	self.stop()
	self.end_cancel_thread()

	self.reconnect(10)

	def _NH_RTPStatisticsLog(self, notification):
	if not self.show_rtp_statistics:
	return

	self.output.put(notification.data.line)

	def _NH_RTPWasLost(self, notification):
	count = notification.data.count
	- self.account.rtp.hangup_on_timeout and count >= 4:
	+ if self.account.rtp.hangup_on_timeout and count >= 4:
	self.rtp_lost = True
	notification.sender.end()

	def reconnect(self, after=5):
	if not self.auto_reconnect:
	return

	api.sleep(after)
	notification_center = NotificationCenter()
	notification_center.post_notification('SessionMustReconnect', data=NotificationData(target=str(self.target)))

	def auto_answer_allowed(self, uri):
	if not self.options.auto_answer_uris:
	self.output.put('Auto answer allowed for %s\n' % uri)
	return True

	uri = uri.split(":")[1]
	auto_answer_uris = self.options.auto_answer_uris.split(",")

	if uri in auto_answer_uris:
	self.output.put('Auto answer allowed for %s\n' % uri)
	return True

	self.output.put('Auto answer denied for %s\n' % uri)
	return False

	def _NH_SIPSessionNewIncoming(self, notification):
	session = notification.sender
	for stream in notification.data.streams:
	if stream.type in ('audio', 'chat'):
	break
	else:
	remote_identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	remote_identity = '"%s" <%s>' % (session.remote_identity.display_name, remote_identity)

	self.output.put('Session from %s rejected due to incompatible media\n' % remote_identity)
	session.reject(415)
	return

	self.session_spool_dir = self.spool_dir + "/" + str(uuid.uuid1())

	try:
	makedirs(self.session_spool_dir)
	except Exception as e:
	log.error('Failed to create session spool directory at {directory}: {exception!s}'.format(directory=self.session_spool_dir, exception=e))
	else:
	if self.stop_call_thread is None:
	self.stop_call_thread = CancelThread(self)
	self.stop_call_thread.start()
	self.output.put("To stop the call: touch %s/stop\n" % self.session_spool_dir)

	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=session)
	accepted_types = ['video', 'audio', 'chat'] if self.enable_video else ['audio', 'chat']

	if self.options.auto_answer_interval is not None and self.auto_answer_allowed(str(session.remote_identity.uri)):
	if self.options.auto_answer_interval == 0:
	if len(self.incoming_sessions) == 0:
	session.accept([stream for stream in session.proposed_streams if stream.type in accepted_types])
	else:
	session.reject()
	return
	else:
	def auto_answer():
	self.incoming_sessions.remove(session)
	if len(self.incoming_sessions) == 0:
	session.accept([stream for stream in session.proposed_streams if stream.type in accepted_types])
	else:
	session.reject()
	timer = reactor.callLater(self.options.auto_answer_interval, auto_answer)
	self.answer_timers[id(session)] = timer
	session.send_ring_indication()
	self.incoming_sessions.append(session)
	if len(self.incoming_sessions) == 1:
	self._print_new_session()
	if not self.disable_ringtone:
	if not self.started_sessions:
	if self.wave_inbound_ringtone:
	self.wave_inbound_ringtone.start()
	else:
	self.tone_ringtone.start()

	def _NH_SIPSessionNewOutgoing(self, notification):
	session = notification.sender
	local_identity = str(session.local_identity.uri).split(":")[1]
	if session.local_identity.display_name:
	local_identity = '"%s" <%s>' % (session.local_identity.display_name, local_identity)
	remote_identity = str(session.remote_identity.uri).split(":")[1]
	if session.remote_identity.display_name:
	remote_identity = '"%s" <%s>' % (session.remote_identity.display_name, remote_identity)
	self.output.put("Starting %s session from %s to %s via %s...\n" % ('video' if self.enable_video else 'audio', local_identity, remote_identity, session.route))

	def _NH_SIPSessionGotRingIndication(self, notification):
	if self.wave_outbound_ringtone and not self.disable_ringtone:
	self.wave_outbound_ringtone.start()

	def _NH_SIPSessionDidFail(self, notification):
	code = notification.data.code

	self._playback_end(failed_reason='outgoing-failed-' + str(code))

	session = notification.sender
	script = "%s/%s-%s-fail" % (self.scripts_dir, str(session.remote_identity.uri).split(":")[1], session.direction)
	self.output.put("Check for script %s\n" % script)
	if os.path.exists(script):
	self.output.put("Running script %s\n" % script)
	p = subprocess.Popen(script)

	if code and self.play_failure_code:
	if code == 486:
	text = 'User is busy'
	elif code == 404:
	text = 'User not found'
	elif code == 480:
	text = 'User not online'
	elif code == 408:
	text = 'Connection failed'
	else:
	text = str(notification.data.code)
	try:
	p = subprocess.Popen(['festival', '--tts', '--pipe'], stdin=subprocess.PIPE)
	except FileNotFoundError:
	pass
	else:
	p.communicate(text.encode())

	if not self.disable_ringtone:
	if session.direction == 'incoming' and session in self.incoming_sessions:
	if self.wave_inbound_ringtone:
	self.wave_inbound_ringtone.stop()
	self.tone_ringtone.stop()
	elif session.direction == 'outgoing':
	if self.wave_outbound_ringtone:
	self.wave_outbound_ringtone.stop()

	if notification.data.failure_reason == 'Call completed elsewhere' or notification.data.code == 487:
	self.output.put('Session cancelled\n')
	if session is self.outgoing_session:
	if self.auto_reconnect:
	self.reconnect(10)
	else:
	if not self.enable_playback:
	self.stop()
	self.end_cancel_thread()
	if session in self.incoming_sessions:
	self.incoming_sessions.remove(session)
	elif notification.data.failure_reason == 'user request':
	self.output.put('Session rejected by user (%d %s)\n' % (notification.data.code, notification.data.reason))
	if notification.sender is self.outgoing_session and not self.enable_playback:
	self.stop()
	self.end_cancel_thread()
	else:
	self.output.put('Session failed: %s %s\n' % (notification.data.code, notification.data.failure_reason))
	if session is self.outgoing_session and not self.enable_playback and not self.auto_reconnect:
	self.stop()
	self.end_cancel_thread()

	self.reconnect(10)

	if id(session) in self.answer_timers:
	timer = self.answer_timers[id(session)]
	if timer.active():
	timer.cancel()
	del self.answer_timers[id(session)]
	if self.incoming_sessions:
	self._print_new_session()
	elif session.direction == 'incoming':
	if not self.disable_ringtone:
	if self.wave_inbound_ringtone:
	self.wave_inbound_ringtone.stop()
	self.tone_ringtone.stop()

	self.success = False
	self._remove_lock()

	def _NH_SIPSessionWillStart(self, notification):
	session = notification.sender
	if not self.disable_ringtone:
	if session.direction == 'incoming':
	if self.wave_inbound_ringtone:
	self.wave_inbound_ringtone.stop()
	if not self.incoming_sessions:
	self.tone_ringtone.stop()
	else:
	if self.wave_outbound_ringtone:
	self.wave_outbound_ringtone.stop()

	if id(session) in self.answer_timers:
	timer = self.answer_timers[id(session)]
	if timer.active():
	timer.cancel()
	del self.answer_timers[id(session)]

	script = "%s/%s-%s-start" % (self.scripts_dir, str(session.remote_identity.uri).split(":")[1], session.direction)
	if os.path.exists(script):
	self.output.put("Running script %s\n" % script)
	p = subprocess.Popen(script)

	def _NH_SIPSessionDidStart(self, notification):
	notification_center = NotificationCenter()
	session = notification.sender
	self.output.put('Session started with %d streams\n' % len(notification.data.streams))
	if session.remote_user_agent is not None:
	self.output.put('Remote SIP User Agent is "%s"\n' % session.remote_user_agent)

	for stream in notification.data.streams:
	if stream.type in ('audio', 'video'):
	self.output.put('%s stream established using %s codec at %sHz\n' % (stream.type.title(), stream.codec.capitalize(), stream.sample_rate))

	if stream.ice_active:
	self.output.put('%s RTP endpoints %s:%d (ICE type %s) <-> %s:%d (ICE type %s)\n' % (stream.type.title(), stream.local_rtp_address,
	stream.local_rtp_port,
	stream.local_rtp_candidate.type.lower(),
	stream.remote_rtp_address,
	stream.remote_rtp_port,
	stream.remote_rtp_candidate.type.lower()))
	else:
	self.output.put('%s RTP endpoints %s:%d <-> %s:%d\n' % (stream.type.title(),
	stream.local_rtp_address,
	stream.local_rtp_port,
	stream.remote_rtp_address,
	stream.remote_rtp_port))
	if stream.encryption.active:
	self.output.put('%s stream is encrypted using %s (%s)\n' % (stream.type.title(), stream.encryption.type, stream.encryption.cipher))


	self.started_sessions.append(session)
	if self.active_session is not None:
	self.active_session.hold()
	self.active_session = session
	if len(self.started_sessions) > 1:
	message = 'Connected sessions:\n'
	for session in self.started_sessions:
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)
	message += ' Session %s (%d/%d) - %s\n' % (identity, self.started_sessions.index(session)+1, len(self.started_sessions), 'active' if session is self.active_session else 'on hold')
	message += 'Press arrow keys to switch the active session\n'
	self.output.put(message)

	if self.incoming_sessions:
	if not self.disable_ringtone:
	self.tone_ringtone.start()
	self._print_new_session()

	for stream in notification.data.streams:
	notification_center.add_observer(self, sender=stream)

	if self.options.auto_hangup_interval is not None:
	if self.options.auto_hangup_interval == 0:
	session.end()
	else:
	timer = reactor.callLater(self.options.auto_hangup_interval, session.end)
	self.hangup_timers[id(session)] = timer

	if self.auto_record:
	settings = SIPSimpleSettings()
	audio_stream = self.active_session.streams[0]
	direction = session.direction
	remote = "%s@%s" % (session.remote_identity.uri.user, session.remote_identity.uri.host)
	filename = "%s-%s-%s.wav" % (datetime.now().strftime("%Y%m%d-%H%M%S"), remote, direction)
	path = os.path.join(settings.audio.directory.normalized, session.account.id, datetime.now().strftime("%Y%m%d"))
	makedirs(path)
	audio_stream.start_recording(os.path.join(path, filename))

	def _NH_SIPSessionWillEnd(self, notification):
	notification_center = NotificationCenter()

	session = notification.sender
	if id(session) in self.hangup_timers:
	timer = self.hangup_timers[id(session)]
	if timer.active():
	timer.cancel()
	del self.hangup_timers[id(session)]

	if not self.disable_hanguptone:
	hangup_tone = WavePlayer(self.voice_audio_mixer, ResourcePath('sounds/hangup_tone.wav').normalized)
	notification_center.add_observer(self, sender=hangup_tone)
	self.voice_audio_bridge.add(hangup_tone)
	hangup_tone.start()

	def end_session_if_needed(self):
	if not self.session_spool_dir:
	return False

	stop_call_file = self.session_spool_dir + "/stop"

	if stop_call_file and os.path.exists(stop_call_file):
	if self.active_session is not None:
	self.output.put('Ending audio session...\n')
	self.active_session.end()
	elif self.outgoing_session is not None:
	self.outgoing_session.end()
	elif self.incoming_sessions:
	session = self.incoming_sessions.pop(0)
	session.reject()
	return True

	return False

	def stop_if_needed(self):
	stop_file = self.spool_dir + "/stop"

	if stop_file and os.path.exists(stop_file):
	if self.active_session is not None:
	self.output.put('Ending audio session...\n')
	self.active_session.end()
	elif self.outgoing_session is not None:
	self.outgoing_session.end()
	elif self.incoming_sessions:
	session = self.incoming_sessions.pop(0)
	session.reject()
	self.stop()
	self.end_cancel_thread()

	def end_cancel_thread(self):
	if self.stop_call_thread is not None:
	self.stop_call_thread.stop()
	self.stop_call_thread = None

	if self.session_spool_dir:
	try:
	shutil.rmtree(self.session_spool_dir)
	except OSError:
	pass

	self.session_spool_dir = None

	def _NH_TLSTransportHasChanged(self, notification):
	self.output.put('TLS verify server: %s\n' % notification.data.verify_server)
	self.output.put('TLS certificate: %s\n' % notification.data.certificate)
	if notification.data.certificate:
	try:
	contents = open(os.path.expanduser(notification.data.certificate), 'rb').read()
	certificate = X509Certificate(contents) # validate the certificate
	except (GNUTLSError, OSError) as e:
	self.output.put('Cannot read TLS certificate: %s\n' % str(e))
	pass
	else:
	self.output.put('TLS Subject: %s\n' % certificate.subject)

	def _NH_SIPSessionDidEnd(self, notification):
	self.end_cancel_thread()
	reactor.callLater(0.1, self._remove_lock)

	session = notification.sender
	if session is not self.active_session:
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)
	else:
	identity = '\b'
	if notification.data.end_reason == 'user request':
	self.output.put('Session %s ended by %s party\n' % (identity, notification.data.originator))
	else:
	self.output.put('Session %s ended due to error: %s\n' % (identity, notification.data.end_reason))

	if session.end_time and 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)
	self.output.put('Session duration was %s\n' % duration_text)

	try:
	self.started_sessions.remove(session)
	except ValueError:
	self.output.put('Session ended without starting')
	return

	if session is self.active_session:
	if self.started_sessions:
	self.active_session = self.started_sessions[0]
	self.active_session.unhold()
	self.ignore_local_unhold = True
	identity = str(self.active_session.remote_identity.uri)
	if self.active_session.remote_identity.display_name:
	identity = '"%s" <%s>' % (self.active_session.remote_identity.display_name, identity)
	self.output.put('Active audio session: "%s" (%d/%d)\n' % (identity, self.started_sessions.index(self.active_session)+1, len(self.started_sessions)))
	else:
	self.active_session = None

	if session is self.outgoing_session:
	rtp_lost = self.rtp_lost
	self.rtp_lost = False

	if notification.data.originator == 'remote' and self.auto_reconnect:
	self.reconnect(5)
	else:
	if rtp_lost and self.auto_reconnect:
	self.reconnect(5)
	self.rtp_lost = False
	else:
	if not self.enable_playback:
	self.stop()
	self.end_cancel_thread()

	script = "%s/%s-%s-end" % (self.scripts_dir, str(session.remote_identity.uri).split(":")[1], session.direction)
	if os.path.exists(script):
	self.output.put("Running script %s\n" % script)
	p = subprocess.Popen(script)

	on_hold_streams = [stream for stream in chain(*(session.streams for session in self.started_sessions)) if stream.on_hold]
	if not on_hold_streams and self.hold_tone and self.hold_tone.is_active:
	self.hold_tone.stop()

	self.success = True

	def _NH_SIPSessionDidChangeHoldState(self, notification):
	session = notification.sender
	if notification.data.on_hold:
	if notification.data.originator == 'remote':
	if session is self.active_session:
	self.output.put('Remote party has put the audio session on hold\n')
	else:
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)
	self.output.put('%s has put the audio session on hold\n' % identity)
	elif not self.ignore_local_hold:
	if session is self.active_session:
	self.output.put('Session is put on hold\n')
	else:
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)
	self.output.put('Session %s is put on hold\n' % identity)
	else:
	self.ignore_local_hold = False
	else:
	if notification.data.originator == 'remote':
	if session is self.active_session:
	self.output.put('Remote party has taken the audio session out of hold\n')
	else:
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)
	self.output.put('%s has taken the audio session out of hold\n' % identity)
	elif not self.ignore_local_unhold:
	if session is self.active_session:
	self.output.put('Session is taken out of hold\n')
	else:
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)
	self.output.put('Session %s is taken out of hold\n' % identity)
	else:
	self.ignore_local_unhold = False

	def _NH_SIPSessionNewProposal(self, notification):
	if notification.data.originator == 'remote':
	session = notification.sender
	accepted_types = ['video', 'audio', 'chat'] if self.enable_video else ['audio', 'chat']
	streams = [stream for stream in notification.data.proposed_streams if stream.type in accepted_types]
	if audio_streams:
	session.accept_proposal(streams)
	else:
	session.reject_proposal(488)

	def _NH_AudioStreamGotDTMF(self, notification):
	notification_center = NotificationCenter()
	digit = notification.data.digit
	filename = 'sounds/dtmf_%s_tone.wav' % {'*': 'star', '#': 'pound'}.get(digit, digit)
	self.output.put('DTMF code received: %s\n' % digit)
	wave_player = WavePlayer(self.voice_audio_mixer, ResourcePath(filename).normalized)
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=wave_player)
	self.voice_audio_bridge.add(wave_player)
	wave_player.start()

	def _NH_SIPSessionGotConferenceInfo(self, notification):
	info = notification.data.conference_info
	self.output.put('Conference users: %s\n' % ", ".join(user.entity.split(":")[1] for user in info.users))
	if info.conference_description.resources:
	for file in info.conference_description.resources.files:
	self.output.put('Conference shared file: %s (%s bytes)\n' % (file.name, file.size))

	def _NH_RTPStreamDidTimeout(self, notification):
	self.output.put('RTP timeout')
	stream = notification.sender

	if self.account.rtp.hangup_on_timeout:
	try:
	session = next(session for session in self.started_sessions if stream in session.streams)
	except StopIteration:
	self.output.put('Session not found')
	else:
	session.end()

	def _NH_RTPStreamICENegotiationStateDidChange(self, notification):
	data = notification.data
	if data.state == 'GATHERING':
	self.output.put("Gathering ICE Candidates...\n")
	elif data.state == 'NEGOTIATION_START':
	self.output.put("Connecting...\n")
	elif data.state == 'NEGOTIATING':
	self.output.put("Negotiating ICE...\n")
	elif data.state == 'GATHERING_COMPLETE':
	self.output.put("Gathering Complete\n")
	elif data.state == 'RUNNING':
	self.output.put("ICE Negotiation Succeeded\n")
	elif data.state == 'FAILED':
	self.output.put("ICE Negotiation Failed\n", True)

	def _NH_RTPStreamICENegotiationDidFail(self, notification):
	stream = notification.sender
	self.output.put('%s ICE negotiation failed: %s' % (notification.sender.type, notification.data.reason))

	def _NH_MediaStreamDidStart(self, notification):
	stream = notification.sender
	if stream.type == 'audio' and self.play_file:
	script = "%s/scripts/%s-playback-start" % (self.playback_dir, self.target)
	if os.path.exists(script):
	self.output.put("Running script %s\n" % script)
	p = subprocess.Popen(script)
	else:
	self.output.put("Script does not exist %s\n" % script)

	self.playback_wave_player = WavePlayer(self.voice_audio_mixer, ResourcePath(self.play_file).normalized)
	notification_center = NotificationCenter()
	notification_center.add_observer(self, sender=self.playback_wave_player)
	self.output.put("Playback file %s\n" % self.play_file)
	stream.bridge.add(self.playback_wave_player)
	self.playback_wave_player.start()

	def _NH_RTPStreamICENegotiationDidSucceed(self, notification):
	stream = notification.sender
	self.output.put('%s ICE negotiation succeeded\n' % stream.type)
	self.output.put('%s RTP endpoints: %s:%d (%s) <-> %s:%d (%s)\n' % (stream.type, stream.local_rtp_address,
	stream.local_rtp_port,
	self.stream.local_rtp_candidate.type.lower(),
	stream.remote_rtp_address,
	stream.remote_rtp_port,
	stream.remote_rtp_candidate.type.lower()))

	if stream.local_rtp_candidate.type.lower() != 'relay' and stream.remote_rtp_candidate.type.lower() != 'relay':
	self.output.put('%s stream is peer to peer\n' % stream.type)
	else:
	self.output.put('%s stream is relayed by server\n' % stream.type)

	def _NH_RTPStreamDidChangeHoldState(self, notification):
	if notification.data.on_hold:
	if self.hold_tone and not self.hold_tone.is_active:
	self.hold_tone.start()
	else:
	on_hold_streams = [stream for stream in chain(*(session.streams for session in self.started_sessions)) if stream is not notification.sender and stream.on_hold]
	if self.hold_tone and not on_hold_streams and self.hold_tone.is_active:
	self.hold_tone.stop()

	def _NH_RTPStreamDidChangeRTPParameters(self, notification):
	stream = notification.sender
	self.output.put('Audio RTP parameters changed:\n')
	self.output.put('Audio stream using "%s" codec at %sHz\n' % (stream.codec, stream.sample_rate))
	self.output.put('Audio RTP endpoints %s:%d <-> %s:%d\n' % (stream.local_rtp_address, stream.local_rtp_port, stream.remote_rtp_address, stream.remote_rtp_port))
	if stream.encryption.active:
	self.output.put('RTP audio stream is encrypted using %s (%s)\n' % (stream.encryption.type, stream.encryption.cipher))

	def _NH_RTPStreamZRTPLog(self, notification):
	if 'Dropping packet' in notification.data.message:
	return
	#self.output.put('ZRTP message: %s\n' % notification.data.message)

	def _NH_RTPStreamDidEnableEncryption(self, notification):
	stream = notification.sender
	self.output.put("%s encryption activated using %s (%s)\n" % (stream.type.title(), stream.encryption.type, stream.encryption.cipher))

	if stream.encryption.type == 'ZRTP':
	peer_name = stream.encryption.zrtp.peer_name if stream.encryption.zrtp.peer_name else None
	sas = stream.encryption.zrtp.sas.decode() if isinstance(stream.encryption.zrtp.sas, bytes) else stream.encryption.zrtp.sas
	self.output.put("ZRTP secret is %s\n" % sas)
	self.output.put("ZRTP peer name is %s\n" % (peer_name or 'not set'))
	self.output.put("ZRTP peer is %s\n" % ('verified' if stream.encryption.zrtp.verified else 'not verified'))

	def _NH_ChatStreamGotMessage(self, notification):
	if not notification.data.message.content_type.startswith("text/"):
	return
	self.output.put(notification.data.message.content)

	def _NH_AudioStreamDidStartRecording(self, notification):
	self.output.put('Recording audio to %s\n' % notification.data.filename)

	def _NH_AudioStreamDidStopRecording(self, notification):
	self.output.put('Stopped recording audio to %s\n' % notification.data.filename)

	def _NH_WavePlayerDidFail(self, notification):
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=notification.sender)
	self.output.put('Failed to play %s: %s\n' % (notification.sender.filename, notification.data.error))
	if notification.sender == self.playback_wave_player or self.play_file:
	if self.active_session:
	self.active_session.end()

	self._playback_end(failed_reason='outgoing-failed-playback')

	def _NH_WavePlayerDidEnd(self, notification):
	notification_center = NotificationCenter()
	notification_center.remove_observer(self, sender=notification.sender)

	self._playback_end()

	if notification.sender == self.playback_wave_player:
	self.active_session.end()

	def _playback_end(self, failed_reason=None):
	if not self.play_file:
	return

	settings = SIPSimpleSettings()

	if failed_reason or not self.auto_record:
	save_path = os.path.join(settings.audio.directory.normalized, self.account.id, datetime.now().strftime("%Y%m%d"))
	makedirs(save_path)
	base = Path(self.play_file).stem
	ext = Path(self.play_file).suffix
	save_path = save_path + '/' + base + '-' + (failed_reason or 'outgoing') + ext
	self.output.put("Saved playback file to %s\n" % save_path)
	os.rename(self.play_file, save_path)

	if not failed_reason:
	rogertone = settings.sounds.roger_beep
	roger_tone = WavePlayer(SIPApplication.voice_audio_mixer, rogertone.path.normalized)
	SIPApplication.voice_audio_bridge.add(roger_tone)
	roger_tone.start()
	else:
	hangup_tone = WavePlayer(SIPApplication.voice_audio_mixer, ResourcePath('sounds/hangup_tone.wav').normalized)
	SIPApplication.voice_audio_bridge.add(hangup_tone)
	hangup_tone.start()

	script = "%s/scripts/%s-playback-end" % (self.playback_dir, self.target)

	if os.path.exists(script):
	self.output.put("Running script %s\n" % script)
	p = subprocess.Popen(script)

	if os.path.exists(self.play_file):
	try:
	os.remove(self.play_file)
	except OSError:
	pass

	self.play_file = None

	def _remove_lock(self):
	# used by external audio recorder to know if we are in call
	self.outgoing_session = None
	lock_file = "%s/playback.lock" % self.playback_dir
	if os.path.exists(lock_file):
	self.output.put("Lock file %s removed\n" % lock_file)
	os.remove(lock_file)

	def _NH_DefaultAudioDeviceDidChange(self, notification):
	SIPApplication._NH_DefaultAudioDeviceDidChange(self, notification)
	if notification.data.changed_input and self.voice_audio_mixer.input_device=='system_default':
	self.output.put('Switched default input device to: %s\n' % self.voice_audio_mixer.real_input_device)
	if notification.data.changed_output and self.voice_audio_mixer.output_device=='system_default':
	self.output.put('Switched default output device to: %s\n' % self.voice_audio_mixer.real_output_device)
	if notification.data.changed_output and self.alert_audio_mixer.output_device=='system_default':
	self.output.put('Switched alert device to: %s\n' % self.alert_audio_mixer.real_output_device)

	def _NH_AudioDevicesDidChange(self, notification):
	old_devices = set(notification.data.old_devices)
	new_devices = set(notification.data.new_devices)
	added_devices = new_devices - old_devices
	removed_devices = old_devices - new_devices
	changed_input_device = self.voice_audio_mixer.real_input_device in removed_devices
	changed_output_device = self.voice_audio_mixer.real_output_device in removed_devices
	changed_alert_device = self.alert_audio_mixer.real_output_device in removed_devices

	SIPApplication._NH_AudioDevicesDidChange(self, notification)

	if added_devices:
	self.output.put('Added audio device(s): %s\n' % ', '.join(sorted(added_devices)))
	if removed_devices:
	self.output.put('Removed audio device(s): %s\n' % ', '.join(sorted(removed_devices)))
	if changed_input_device:
	self.output.put('Audio input device has been switched to: %s\n' % self.voice_audio_mixer.real_input_device)
	if changed_output_device:
	self.output.put('Audio output device has been switched to: %s\n' % self.voice_audio_mixer.real_output_device)
	if changed_alert_device:
	self.output.put('Audio alert device has been switched to: %s\n' % self.alert_audio_mixer.real_output_device)

	self.output.put('Available audio input devices: %s\n' % ', '.join(['None', 'system_default'] + sorted(self.engine.input_devices)))
	self.output.put('Available audio output devices: %s\n' % ', '.join(['None', 'system_default'] + sorted(self.engine.output_devices)))

	def _NH_RTPStreamICENegotiationDidSucceed(self, notification):
	self.output.put("ICE negotiation succeeded in %s\n" % notification.data.duration)

	def _NH_RTPStreamICENegotiationDidFail(self, notification):
	self.output.put("ICE negotiation failed: %s\n" % notification.data.reason.decode())

	def _print_new_session(self):
	session = self.incoming_sessions[0]
	identity = str(session.remote_identity.uri)
	if session.remote_identity.display_name:
	identity = '"%s" <%s>' % (session.remote_identity.display_name, identity)

	video_streams = [stream for stream in session.proposed_streams if stream.type in ['video']]
	media_type = 'video' if video_streams else 'audio'
	self.output.put("Incoming %s session from '%s', do you want to accept? (y/n)\n" % (media_type, identity))

	def parse_handle_call_option(option, opt_str, value, parser, name):
	try:
	value = parser.rargs[0]
	except IndexError:
	value = 0
	else:
	if value == '' or value[0] == '-':
	value = 0
	else:
	try:
	value = int(value)
	except ValueError:
	value = 0
	else:
	del parser.rargs[0]
	setattr(parser.values, name, value)

	if __name__ == '__main__':
	description = 'This script can sit idle waiting for an incoming audio session, or initiate an outgoing audio session to a SIP address. The program will close the session and quit when Ctrl+D is pressed.'
	usage = '%prog [options] [user@domain]'
	parser = OptionParser(usage=usage, description=description)
	parser.print_usage = parser.print_help
	parser.add_option('-a', '--account', type='string', dest='account', help='The account name to use for any outgoing traffic. If not supplied, the default account will be used.', metavar='NAME')
	parser.add_option('-c', '--config-directory', type='string', dest='config_directory', help='The configuration directory to use. This overrides the default location.')
	parser.add_option('-d', '--playback-dir', type='string', dest='playback_dir', help='Directory with wav files to be played after calling. The destination SIP address is taken from the filename. After playback the call is hangup')
	parser.add_option('-p', '--enable_playback', action='store_true', dest='enable_playback', default=False, help='Enable polling playback directory for new wavs.')
	parser.add_option('-l', '--log-register', action='store_true', dest='log_register', default=False, help='Log result of registrations.')
	parser.add_option('-s', '--trace-sip', action='store_true', dest='trace_sip', default=False, help='Dump the raw contents of incoming and outgoing SIP messages.')
	parser.add_option('-j', '--trace-pjsip', action='store_true', dest='trace_pjsip', default=False, help='Print PJSIP logging output.')
	parser.add_option('-r', '--auto-record', action='store_true', dest='auto_record', default=False, help='Automatic recording of voice calls.')
	parser.add_option('-n', '--trace-notifications', action='store_true', dest='trace_notifications', default=False, help='Print all notifications (disabled by default).')
	parser.add_option('--disable-ringtone', action='store_true', dest='disable_ringtone', default=False, help='Disable ringtone.')
	parser.add_option('-g', '--disable-hanguptone', action='store_true', dest='disable_hanguptone', default=False, help='Disable hangup tone.')
	parser.add_option('-S', '--disable-sound', action='store_true', dest='disable_sound', default=False, help='Disables initializing the sound card.')
	parser.set_default('auto_answer_interval', None)
	parser.add_option('--auto-answer', action='callback', callback=parse_handle_call_option, callback_args=('auto_answer_interval',), help='Interval after which to answer an incoming session (disabled by default). If the option is specified but the interval is not, it defaults to 0 (accept the session as soon as it starts ringing).', metavar='[INTERVAL]')
	parser.add_option('-u', '--auto-answer-uris', type='string', dest='auto_answer_uris', default="", help='Optional list of SIP URIs for which auto-answer is allowed')
	parser.add_option('-i', '--external-id', type='string', dest='external_id', help='id used for call control from external application')
	parser.add_option('-v', '--spool-dir', type='string', dest='spool_dir', default=None, help='Spool dir for call control from external applications, default is /var/spool/sipclients/sessions')
	parser.add_option('-t', '--enable-default-devices', action='store_true', dest='enable_default_devices', help='Use default audio devices')
	parser.add_option('-m', '--mute', action='store_true', dest='mute', help='Mute microphone')
	parser.add_option('-V', '--enable-video', action='store_true', dest='enable_video', default=False, help='Enable video if camera is available')
	parser.set_default('auto_hangup_interval', None)
	parser.add_option('--auto-hangup', action='callback', callback=parse_handle_call_option, callback_args=('auto_hangup_interval',), help='Interval after which to hang up an established session (disabled by default). If the option is specified but the interval is not, it defaults to 0 (hangup the session as soon as it connects).', metavar='[INTERVAL]')
	parser.add_option('-b', '--batch', action='store_true', dest='batch_mode', default=False, help='Run the program in batch mode: reading input from the console is disabled and the option --auto-answer is implied. This is particularly useful when running this script in a non-interactive environment.')
	parser.add_option('-f', '--play-failure-code', action='store_true', dest='play_failure_code', default=False, help='Play failure code using festival.')
	parser.add_option('-D', '--daemonize', action='store_true', dest='daemonize', default=False, help='Enable running this program as a deamon.')
	parser.add_option('-R', '--auto-reconnect', action='store_true', dest='auto_reconnect', default=False, help='Auto reconnect call if disconnected by remote.')
	options, args = parser.parse_args()

	target = args[0] if args and not options.auto_answer_uris else None

	application = SIPAudioApplication()
	application.start(target, options)

	signal.signal(signal.SIGINT, signal.SIG_DFL)
	application.output.join()
	sleep(0.1)

	sys.exit(0 if application.success else 1)

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