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	diff --git a/sipsimple/session.py b/sipsimple/session.py
	index e60f8257..20c3888b 100644
	--- a/sipsimple/session.py
	+++ b/sipsimple/session.py
	@@ -1,1087 +1,1087 @@
	from __future__ import with_statement
	from thread import allocate_lock
	from datetime import datetime
	from collections import deque
	from threading import Timer
	import os.path
	import traceback

	from zope.interface import implements

	from application.notification import IObserver, NotificationCenter, NotificationData
	from application.python.util import Singleton

	from sipsimple.engine import Engine
	from sipsimple.core import Invitation, SDPSession, SDPMedia, SDPAttribute, SDPConnection, RTPTransport, AudioTransport, WaveFile, RecordingWaveFile, SIPCoreError
	from sipsimple.msrp import MSRPChat
	from sipsimple.account import AccountManager
	from sipsimple.util import NotificationHandler
	from sipsimple.configuration.settings import SIPSimpleSettings

	class SessionStateError(Exception):
	pass


	class TimestampedNotificationData(NotificationData):

	def __init__(self, **kwargs):
	self.timestamp = datetime.now()
	NotificationData.__init__(self, **kwargs)


	class AccountRTPTransport(RTPTransport):

	def __init__(self, account, transport):
	settings = SIPSimpleSettings()
	kwargs = dict(local_rtp_address=settings.local_ip.value)
	- kwargs["use_srtp"] = (transport == "tls" or not account.audio.use_srtp_without_tls) and account.audio.srtp_encryption != "disabled"
	+ kwargs["use_srtp"] = (transport == "tls" or account.audio.use_srtp_without_tls) and account.audio.srtp_encryption != "disabled"
	kwargs["srtp_forced"] = kwargs["use_srtp"] and account.audio.srtp_encryption == "mandatory"
	kwargs["use_ice"] = hasattr(account, "ice") and account.ice.enabled
	# TODO: look this up, also if not specified
	if kwargs["use_ice"] and account.ice.use_stun and len(account.stun_servers) > 0:
	kwargs["ice_stun_address"], kwargs["ice_stun_port"] = account.stun_servers[0]
	RTPTransport.__init__(self, **kwargs)


	class MediaTransportInitializer(NotificationHandler):
	implements(IObserver)

	def __init__(self, continuation_func, failure_func, audio_rtp, msrp_chat):
	self.continuation_func = continuation_func
	self.failure_func = failure_func
	self.audio_rtp = audio_rtp
	self.msrp_chat = msrp_chat
	self.notification_center = NotificationCenter()
	self.waiting_for = []
	self._lock = allocate_lock()
	with self._lock:
	for rtp in [audio_rtp]:
	if rtp is not None:
	self.waiting_for.append(rtp)
	self.notification_center.add_observer(self, "SCRTPTransportDidInitialize", rtp)
	self.notification_center.add_observer(self, "SCRTPTransportDidFail", rtp)
	rtp.set_INIT()
	if msrp_chat is not None:
	self.waiting_for.append(msrp_chat)
	self.notification_center.add_observer(self, "MSRPChatDidInitialize", msrp_chat)
	self.notification_center.add_observer(self, "MSRPChatDidFail", msrp_chat)
	msrp_chat.initialize()
	self._check_done()

	def _remove_observer(self, obj):
	self.waiting_for.remove(obj)
	if obj is self.msrp_chat:
	self.notification_center.remove_observer(self, "MSRPChatDidInitialize", obj)
	self.notification_center.remove_observer(self, "MSRPChatDidFail", obj)
	else:
	self.notification_center.remove_observer(self, "SCRTPTransportDidInitialize", obj)
	self.notification_center.remove_observer(self, "SCRTPTransportDidFail", obj)

	def _check_done(self):
	if len(self.waiting_for) == 0:
	self.continuation_func(self.audio_rtp, self.msrp_chat)

	def _fail(self, sender, reason):
	for obj in self.waiting_for[:]:
	self._remove_observer(obj)
	if sender is self.audio_rtp:
	reason = "Failed to initialize audio RTP transport: %s" % reason
	elif sender is self.msrp_chat:
	reason = "Failed to initialize MSRP chat transport: %s" % reason
	self.failure_func(reason)

	def _NH_SCRTPTransportDidInitialize(self, rtp, data):
	with self._lock:
	if len(self.waiting_for) == 0:
	return
	self._remove_observer(rtp)
	self._check_done()

	def _NH_SCRTPTransportDidFail(self, rtp, data):
	with self._lock:
	if len(self.waiting_for) == 0:
	return
	try:
	new_rtp = RTPTransport(rtp.local_rtp_address, rtp.use_srtp, rtp.srtp_forced, rtp.use_ice)
	except SIPCoreError:
	self._fail(rtp, data.reason)
	self._remove_observer(rtp)
	if rtp is self.audio_rtp:
	self.audio_rtp = new_rtp
	self.waiting_for.append(new_rtp)
	self.notification_center.add_observer(self, "SCRTPTransportDidInitialize", new_rtp)
	self.notification_center.add_observer(self, "SCRTPTransportDidFail", new_rtp)
	try:
	new_rtp.set_INIT()
	except SIPCoreError, e:
	self._fail(new_rtp, e.args[0])

	def _NH_MSRPChatDidInitialize(self, msrp, data):
	with self._lock:
	if len(self.waiting_for) == 0:
	return
	self._remove_observer(msrp)
	self._check_done()

	def _NH_MSRPChatDidFail(self, msrp, data):
	with self._lock:
	if len(self.waiting_for) == 0:
	return
	self._fail(msrp, data.reason)


	class Session(NotificationHandler):
	"""Represents a SIP session.
	Attributes:
	state: The state of the object as a string
	remote_user_agent: The user agent of the remote party, once detected
	rtp_options: the RTPTransport options fetched from the SessionManager
	at object creation."""

	def __init__(self, account):
	"""Instatiates a new Session object for an incoming or outgoing
	SIP session. Initially the object is in the NULL state."""
	self.session_manager = SessionManager()
	self.notification_center = NotificationCenter()
	self.settings = SIPSimpleSettings()
	self.account = account
	self.state = "NULL"
	self.remote_user_agent = None
	self.on_hold_by_local = False
	self.on_hold_by_remote = False
	self.start_time = None
	self.stop_time = None
	self.direction = None
	self.audio_transport = None
	self.chat_transport = None
	# TODO: make the following two attributes reflect the current proposal in all states, not just PROPOSING
	self.proposed_audio = False
	self.proposed_chat = False
	self._lock = allocate_lock()
	self._inv = None
	self._audio_sdp_index = -1
	self._chat_sdp_index = -1
	self._queue = deque()
	self._ringtone = None
	self._sdpneg_failure_reason = None
	self._no_audio_timer = None
	self._audio_rec = None

	def __getattr__(self, attr):
	if self._inv is not None:
	if attr in ["caller_uri", "callee_uri", "local_uri", "remote_uri", "credentials", "route"]:
	return getattr(self._inv, attr)
	if self.audio_transport is not None:
	if attr.startswith("audio_"):
	attr = attr.split("audio_", 1)[1]
	if attr in ["sample_rate", "codec"]:
	return getattr(self.audio_transport, attr)
	elif attr in ["srtp_active", "local_rtp_port", "local_rtp_address", "remote_rtp_port_received", "remote_rtp_address_received", "remote_rtp_port_sdp", "remote_rtp_address_sdp"]:
	return getattr(self.audio_transport.transport, attr)
	raise AttributeError("'%s' object has no attribute '%s'" % (self.__class__.__name__, attr))

	@property
	def audio_was_received(self):
	if self.audio_transport is None or not self.audio_transport.is_active:
	return False
	else:
	return self.audio_transport.transport.remote_rtp_address_received is not None

	@property
	def on_hold(self):
	return self.on_hold_by_local or self.on_hold_by_remote

	@property
	def audio_recording_file_name(self):
	if self._audio_rec is None:
	return None
	else:
	return self._audio_rec.file_name

	@property
	def has_audio(self):
	return self.audio_transport is not None

	@property
	def has_chat(self):
	return self.chat_transport is not None

	# user interface
	def connect(self, callee_uri, routes, audio=False, chat=False):
	"""Creates a new SIP session to the callee with the requested stream(s).
	Moves the object from the NULL into the CALLING state."""
	with self._lock:
	if self.state != "NULL":
	raise SessionStateError("This method can only be called while in the NULL state")
	if not any([audio, chat]):
	raise ValueError("No media stream requested")
	route = iter(routes).next()
	inv = Invitation(self.account.credentials, callee_uri, route)
	if audio:
	audio_rtp = AccountRTPTransport(self.account, inv.transport)
	else:
	audio_rtp = None
	if chat:
	msrp_chat = MSRPChat(self.account, callee_uri, True)
	else:
	msrp_chat = None
	ringtone = self.settings.ringtone.outbound
	if ringtone is not None:
	ringtone = WaveFile(ringtone)
	media_initializer = MediaTransportInitializer(self._connect_continue, self._connect_fail, audio_rtp, msrp_chat)
	self._inv = inv
	self.chat_transport = msrp_chat
	self.session_manager.inv_mapping[inv] = self
	if ringtone is not None:
	self._ringtone = ringtone
	self.direction = "outgoing"
	self._change_state("CALLING")
	self.notification_center.post_notification("SCSessionNewOutgoing", self, TimestampedNotificationData(audio=audio, chat=chat))

	def _do_fail(self, reason):
	try:
	self._stop_media()
	except SIPCoreError:
	traceback.print_exc()
	originator = "local"
	del self.session_manager.inv_mapping[self._inv]
	if self._inv.state != "NULL":
	try:
	self._inv.disconnect(500)
	except SIPCoreError:
	traceback.print_exc()
	self._inv = None
	self._change_state("TERMINATED")
	self.notification_center.post_notification("SCSessionDidFail", self, TimestampedNotificationData(originator=originator, code=0, reason=reason))
	self.notification_center.post_notification("SCSessionDidEnd", self, TimestampedNotificationData(originator=originator))

	def _connect_fail(self, reason):
	with self._lock:
	if self.state != "CALLING":
	return
	self._do_fail(reason)

	def _connect_continue(self, audio_rtp, msrp_chat):
	self._lock.acquire()
	try:
	if self.state != "CALLING":
	return
	sdp_index = 0
	local_ip = self.settings.local_ip.value
	local_sdp = SDPSession(local_ip, connection=SDPConnection(local_ip))
	if audio_rtp:
	self._audio_sdp_index = sdp_index
	sdp_index += 1
	local_sdp.media.append(self._init_audio(audio_rtp))
	if audio_rtp.use_ice:
	local_sdp.connection.address = self.audio_transport.transport.local_rtp_address
	if msrp_chat:
	self._chat_sdp_index = sdp_index
	sdp_index += 1
	self.session_manager.msrp_chat_mapping[msrp_chat] = self
	local_sdp.media.append(msrp_chat.local_media)
	self._inv.set_offered_local_sdp(local_sdp)
	self._inv.send_invite()
	except SIPCoreError, e:
	self._do_fail(e.args[0])
	finally:
	self._lock.release()

	def accept(self, audio=False, chat=False):
	"""Accept an incoming SIP session, using the requested stream(s).
	Moves the object from the INCOMING to the ACCEPTING state."""
	with self._lock:
	if self.state != "INCOMING":
	raise SessionStateError("This method can only be called while in the INCOMING state")
	audio_sdp_index = -1
	chat_sdp_index = -1
	remote_sdp = self._inv.get_offered_remote_sdp()
	for sdp_index, sdp_media in enumerate(remote_sdp.media):
	if sdp_media.media == "audio" and audio:
	audio_sdp_index = sdp_index
	elif sdp_media.media == "message" and chat:
	chat_sdp_index = sdp_index
	if audio:
	if audio_sdp_index == -1:
	raise ValueError("Use of audio requested, but audio was not proposed by remote party")
	audio_rtp = AccountRTPTransport(self.account, self._inv.transport)
	else:
	audio_rtp = None
	if chat:
	if chat_sdp_index == -1:
	raise ValueError("Use of MSRP chat requested, but MSRP chat was not proposed by remote party")
	msrp_chat = MSRPChat(self.account, self._inv.remote_uri, False)
	else:
	msrp_chat = None
	if not any([audio_rtp, msrp_chat]):
	raise ValueError("None of the streams proposed by the remote party is accepted")
	media_initializer = MediaTransportInitializer(self._accept_continue, self._accept_fail, audio_rtp, msrp_chat)
	self._audio_sdp_index = audio_sdp_index
	self._chat_sdp_index = chat_sdp_index
	self.chat_transport = msrp_chat
	self._change_state("ACCEPTING")

	def _accept_fail(self, reason):
	with self._lock:
	if self.state != "ACCEPTING":
	return
	self._do_fail(reason)

	def _accept_continue(self, audio_rtp, msrp_chat):
	self._lock.acquire()
	try:
	if self.state != "ACCEPTING":
	return
	remote_sdp = self._inv.get_offered_remote_sdp()
	local_ip = self.settings.local_ip.value
	local_sdp = SDPSession(local_ip, connection=SDPConnection(local_ip), media=len(remote_sdp.media)*[None], start_time=remote_sdp.start_time, stop_time=remote_sdp.stop_time)
	sdp_media_todo = range(len(remote_sdp.media))
	if audio_rtp:
	sdp_media_todo.remove(self._audio_sdp_index)
	local_sdp.media[self._audio_sdp_index] = self._init_audio(audio_rtp, remote_sdp)
	if audio_rtp.use_ice:
	local_sdp.connection.address = self.audio_transport.transport.local_rtp_address
	if msrp_chat:
	sdp_media_todo.remove(self._chat_sdp_index)
	self.session_manager.msrp_chat_mapping[msrp_chat] = self
	local_sdp.media[self._chat_sdp_index] = msrp_chat.local_media
	for reject_media_index in sdp_media_todo:
	remote_media = remote_sdp.media[reject_media_index]
	local_sdp.media[reject_media_index] = SDPMedia(remote_media.media, 0, remote_media.transport, formats=remote_media.formats)
	self._inv.set_offered_local_sdp(local_sdp)
	self._inv.accept_invite()
	except SIPCoreError, e:
	self._inv.disconnect(500)
	self._do_fail(e.args[0])
	finally:
	self._lock.release()

	def reject(self):
	"""Rejects an incoming SIP session. Moves the object from the INCOMING to
	the TERMINATING state."""
	with self._lock:
	if self.state == "TERMINATED":
	return
	if self.state != "INCOMING":
	raise SessionStateError("This method can only be called while in the INCOMING state")
	self._do_terminate()

	def add_audio(self):
	"""Add an audio RTP stream to an already established SIP session."""
	with self._lock:
	if self.state != "ESTABLISHED":
	raise SessionStateError("This method can only be called while in the ESTABLISHED state")
	if self.audio_transport is not None:
	raise RuntimeError("An audio RTP stream is already active within this SIP session")
	self._queue.append("add_audio")
	if len(self._queue) == 1:
	self._process_queue()

	def remove_audio(self):
	with self._lock:
	if self.state != "ESTABLISHED":
	raise SessionStateError("This method can only be called while in the ESTABLISHED state")
	if self.audio_transport is None:
	raise RuntimeError("No audio RTP stream is active within this SIP session")
	if not any([self.chat_transport]):
	raise RuntimeError("Removing audio would leave the SIP session without active media")
	self._queue.append("remove_audio")
	if len(self._queue) == 1:
	self._process_queue()

	def add_chat(self):
	with self._lock:
	if self.state != "ESTABLISHED":
	raise SessionStateError("This method can only be called while in the ESTABLISHED state")
	if self.chat_transport is not None:
	raise RuntimeError("An MSRP chat stream is already active within this SIP session")
	self._queue.append("add_chat")
	if len(self._queue) == 1:
	self._process_queue()

	def remove_chat(self):
	with self._lock:
	if self.state != "ESTABLISHED":
	raise SessionStateError("This method can only be called while in the ESTABLISHED state")
	if self.chat_transport is None:
	raise RuntimeError("No MSRP chat stream is active within this SIP session")
	if not any([self.audio_transport]):
	raise RuntimeError("Removing MSRP chat would leave the SIP session without active media")
	self._queue.append("remove_chat")
	if len(self._queue) == 1:
	self._process_queue()

	def accept_proposal(self, audio=False, chat=False):
	"""Accept a proposal of stream(s) being added. Moves the object from
	the PROPOSED state to the ESTABLISHED state."""
	with self._lock:
	if self.state != "PROPOSED":
	raise SessionStateError("This method can only be called while in the PROPOSED state")
	remote_sdp = self._inv.get_offered_remote_sdp()
	audio_rtp = None
	msrp_chat = None
	for media in remote_sdp.media:
	if audio and self.audio_transport is None and media.media == "audio" and media.port != 0 and audio_rtp is None:
	audio_rtp = AccountRTPTransport(self.account, self._inv.transport)
	elif chat and self.chat_transport is None and media.media == "message" and media.port != 0 and msrp_chat is None:
	msrp_chat = MSRPChat(self.account, self._inv.remote_uri, False)
	if not any([audio_rtp, msrp_chat]):
	raise ValueError("None of the streams proposed by the remote party is accepted")
	media_initializer = MediaTransportInitializer(self._accept_proposal_continue, self._accept_proposal_fail, audio_rtp, msrp_chat)
	self.chat_transport = msrp_chat

	def _do_reject_proposal(self, code=488, reason=None):
	self._change_state("ESTABLISHED")
	self.notification_center.post_notification("SCSessionRejectedStreamProposal", self, TimestampedNotificationData(proposer="remote", reason=reason))
	self._inv.respond_to_reinvite(code)

	def _accept_proposal_fail(self, reason):
	with self._lock:
	if self.state != "PROPOSED":
	return
	self._cancel_media()
	try:
	self._do_reject_proposal(500, reason)
	except SIPCoreError:
	traceback.print_exc()

	def _accept_proposal_continue(self, audio_rtp, msrp_chat):
	self._lock.acquire()
	try:
	if self.state != "PROPOSED":
	return
	remote_sdp = self._inv.get_offered_remote_sdp()
	local_sdp = self._make_next_sdp(False)
	if len(remote_sdp.media) > len(local_sdp.media):
	local_sdp.media.extend((len(remote_sdp.media) - len(local_sdp.media))*[None])
	audio_sdp_index = -1
	chat_sdp_index = -1
	for sdp_index, media in enumerate(remote_sdp.media):
	if audio_rtp is not None and media.media == "audio" and media.port != 0 and audio_sdp_index == -1:
	audio_sdp_index = sdp_index
	local_sdp.media[sdp_index] = self._init_audio(audio_rtp, remote_sdp)
	if audio_rtp.use_ice:
	local_sdp.connection.address = self.audio_transport.transport.local_rtp_address
	elif msrp_chat is not None and media.media == "message" and media.port != 0 and chat_sdp_index == -1:
	chat_sdp_index = sdp_index
	self.session_manager.msrp_chat_mapping[msrp_chat] = self
	local_sdp.media.append(msrp_chat.local_media)
	elif local_sdp[sdp_index] is None:
	remote_media = remote_sdp.media[sdp_index]
	local_sdp.media[sdp_index] = SDPMedia(remote_media.media, 0, remote_media.transport, formats=remote_media.formats)
	self._inv.set_offered_local_sdp(local_sdp)
	self._inv.respond_to_reinvite(200)
	if audio_rtp is not None:
	self._audio_sdp_index = audio_sdp_index
	if msrp_chat is not None:
	self._chat_sdp_index = chat_sdp_index
	self._change_state("ESTABLISHED")
	self.notification_center.post_notification("SCSessionAcceptedStreamProposal", self, TimestampedNotificationData(proposer="remote"))
	except SIPCoreError, e:
	self._cancel_media()
	try:
	self._do_reject_proposal(500, e.args[0])
	except SIPCoreError:
	traceback.print_exc()
	finally:
	self._lock.release()

	def reject_proposal(self):
	"""Reject a proposal of stream(s) being added. Moves the object from
	the PROPOSED state to the ESTABLISHED state."""
	with self._lock:
	if self.state != "PROPOSED":
	raise SessionStateError("This method can only be called while in the PROPOSED state")
	self._do_reject_proposal(reason="Rejected by user")

	def hold(self):
	"""Put an established SIP session on hold. This moves the object from the
	ESTABLISHED state to the ONHOLD state."""
	with self._lock:
	if self.state != "ESTABLISHED":
	raise SessionStateError("Session is not active")
	self._queue.append("hold")
	if len(self._queue) == 1:
	self._process_queue()

	def unhold(self):
	"""Takes a SIP session that was previous put on hold out of hold. This
	moves the object from the ONHOLD state to the ESTABLISHED state."""
	with self._lock:
	if self.state != "ESTABLISHED":
	raise SessionStateError("Session is not active")
	self._queue.append("unhold")
	if len(self._queue) == 1:
	self._process_queue()

	def terminate(self):
	"""Terminates the SIP session from whatever state it is in.
	Moves the object to the TERMINATING state."""
	with self._lock:
	if self.state in ["NULL", "TERMINATING", "TERMINATED"]:
	return
	self._do_terminate()

	def _do_terminate(self):
	self._change_state("TERMINATING")
	self.notification_center.post_notification("SCSessionWillEnd", self, TimestampedNotificationData())
	if self._inv.state != "DISCONNECTING":
	try:
	self._inv.disconnect()
	except SIPCoreError:
	self._change_state("TERMINATED")
	self.notification_center.post_notification("SCSessionDidEnd", self, TimestampedNotificationData(originator="local"))

	def start_recording_audio(self, file_name=None):
	with self._lock:
	if self.audio_transport is None or not self.audio_transport.is_active:
	raise RuntimeError("No audio RTP stream is active on this SIP session")
	if self._audio_rec is not None:
	raise RuntimeError("Already recording audio to a file")
	if file_name is None:
	direction = "outgoing" if self._inv.is_outgoing else "incoming"
	remote = '%s@%s' % (self._inv.remote_uri.user, self._inv.remote_uri.host)
	file_name = "%s-%s-%s.wav" % (datetime.now().strftime("%Y%m%d-%H%M%S"), remote, direction)
	self.settings.audio.recordings_directory.create()
	self._audio_rec = RecordingWaveFile(os.path.join(self.settings.audio.recordings_directory.value, file_name))
	if not self.on_hold:
	self.notification_center.post_notification("SCSessionWillStartRecordingAudio", self, TimestampedNotificationData(file_name=self._audio_rec.file_name))
	try:
	self._audio_rec.start()
	except SIPCoreError:
	self.notification_center.post_notification("SCSessionDidStopRecordingAudio", self, TimestampedNotificationData(file_name=self._audio_rec.file_name))
	self._audio_rec = None
	raise
	else:
	self.notification_center.post_notification("SCSessionDidStartRecordingAudio", self, TimestampedNotificationData(file_name=self._audio_rec.file_name))

	def stop_recording_audio(self):
	with self._lock:
	if self._audio_rec is None:
	raise RuntimeError("Not recording any audio")
	self._stop_recording_audio()

	def _stop_recording_audio(self):
	self.notification_center.post_notification("SCSessionWillStopRecordingAudio", self, TimestampedNotificationData(file_name=self._audio_rec.file_name))
	try:
	self._audio_rec.stop()
	finally:
	self.notification_center.post_notification("SCSessionDidStopRecordingAudio", self, TimestampedNotificationData(file_name=self._audio_rec.file_name))
	self._audio_rec = None

	def _check_recording_hold(self):
	if self._audio_rec is None:
	return
	if self.on_hold:
	if self._audio_rec.is_active and not self._audio_rec.is_paused:
	self._audio_rec.pause()
	else:
	if self._audio_rec.is_active:
	if self._audio_rec.is_paused:
	self._audio_rec.resume()
	else:
	file_name = self.audio_recording_file_name
	self.notification_center.post_notification("SCSessionWillStartRecordingAudio", self, TimestampedNotificationData(file_name=file_name))
	try:
	self._audio_rec.start()
	except SIPCoreError:
	self._audio_rec = None
	self.notification_center.post_notification("SCSessionDidStopRecordingAudio", self, TimestampedNotificationData(file_name=file_name))
	else:
	self.notification_center.post_notification("SCSessionDidStartRecordingAudio", self, TimestampedNotificationData(file_name=file_name))

	def _start_ringtone(self):
	try:
	self._ringtone.start(loop_count=0, pause_time=2)
	except SIPCoreError:
	traceback.print_exc()

	def _change_state(self, new_state):
	prev_state = self.state
	self.state = new_state
	if prev_state != new_state:
	if new_state == "INCOMING":
	if self._ringtone is not None:
	self._start_ringtone()
	if prev_state == "INCOMING" or prev_state == "CALLING":
	if self._ringtone is not None:
	self._ringtone = None
	self.notification_center.post_notification("SCSessionChangedState", self, TimestampedNotificationData(prev_state=prev_state, state=new_state))

	def _process_queue(self):
	try:
	was_on_hold = self.on_hold_by_local
	local_sdp = None
	while self._queue:
	command = self._queue.popleft()
	if command == "hold":
	if self.on_hold_by_local:
	continue
	if self.audio_transport is not None and self.audio_transport.is_active:
	Engine().disconnect_audio_transport(self.audio_transport)
	local_sdp = self._make_next_sdp(True, True)
	self.on_hold_by_local = True
	break
	elif command == "unhold":
	if not self.on_hold_by_local:
	continue
	if self.audio_transport is not None and self.audio_transport.is_active:
	Engine().connect_audio_transport(self.audio_transport)
	local_sdp = self._make_next_sdp(True, False)
	self.on_hold_by_local = False
	break
	elif command == "remove_audio":
	if self.audio_transport is None:
	continue
	self._stop_audio()
	local_sdp = self._make_next_sdp(True, self.on_hold_by_local)
	break
	elif command == "remove_chat":
	if self.chat_transport is None:
	continue
	self._stop_chat()
	local_sdp = self._make_next_sdp(True, self.on_hold_by_local)
	break
	elif command == "add_audio":
	if self.audio_transport is not None:
	continue
	media_initializer = MediaTransportInitializer(self._add_audio_continue, self._add_audio_fail, AccountRTPTransport(self.account, self._inv.transport), None)
	self.proposed_audio = True
	self._change_state("PROPOSING")
	self.notification_center.post_notification("SCSessionGotStreamProposal", self, TimestampedNotificationData(streams=["audio"], proposer="local"))
	break
	elif command == "add_chat":
	if self.chat_transport is not None:
	continue
	self.chat_transport = MSRPChat(self.account, self._inv.remote_uri, True)
	media_initializer = MediaTransportInitializer(self._add_chat_continue, self._add_chat_fail, None, self.chat_transport)
	self.proposed_chat = True
	self._change_state("PROPOSING")
	self.notification_center.post_notification("SCSessionGotStreamProposal", self, TimestampedNotificationData(streams=["chat"], proposer="local"))
	break
	if local_sdp is not None:
	self._inv.set_offered_local_sdp(local_sdp)
	self._inv.send_reinvite()
	if not was_on_hold and self.on_hold_by_local:
	self._check_recording_hold()
	self.notification_center.post_notification("SCSessionGotHoldRequest", self, TimestampedNotificationData(originator="local"))
	elif was_on_hold and not self.on_hold_by_local:
	self._check_recording_hold()
	self.notification_center.post_notification("SCSessionGotUnholdRequest", self, TimestampedNotificationData(originator="local"))
	except SIPCoreError, e:
	self._do_fail(e.args[0])

	def _add_audio_fail(self, reason):
	with self._lock:
	if self.state != "PROPOSING":
	return
	self.proposed_audio = False
	self._change_state("ESTABLISHED")
	self.notification_center.post_notification("SCSessionRejectedStreamProposal", self, TimestampedNotificationData(proposer="local", reason=reason))

	def _add_audio_continue(self, audio_rtp, msrp_chat):
	self._lock.acquire()
	try:
	if self.state != "PROPOSING":
	return
	local_sdp = self._make_next_sdp(True, self.on_hold_by_local)
	audio_sdp_index = self._audio_sdp_index
	if audio_sdp_index == -1:
	audio_sdp_index = len(local_sdp.media)
	local_sdp.media.append(self._init_audio(audio_rtp))
	if self.on_hold_by_local:
	local_sdp.media[audio_sdp_index].attributes.append(SDPAttribute("sendonly", ""))
	if audio_rtp.use_ice:
	local_sdp.connection.address = self.audio_transport.transport.local_rtp_address
	self._inv.set_offered_local_sdp(local_sdp)
	self._inv.send_reinvite()
	except SIPCoreError, e:
	self.proposed_audio = False
	self._cancel_media()
	self._change_state("ESTABLISHED")
	self.notification_center.post_notification("SCSessionRejectedStreamProposal", self, TimestampedNotificationData(proposer="local", reason=e.args[0]))
	finally:
	self._lock.release()

	def _add_chat_fail(self, reason):
	with self._lock:
	if self.state != "PROPOSING":
	return
	self.proposed_chat = False
	self._stop_chat()
	self._change_state("ESTABLISHED")
	self.notification_center.post_notification("SCSessionRejectedStreamProposal", self, TimestampedNotificationData(proposer="local", reason=reason))

	def _add_chat_continue(self, audio_rtp, msrp_chat):
	self._lock.acquire()
	try:
	if self.state != "PROPOSING":
	return
	local_sdp = self._make_next_sdp(True, self.on_hold_by_local)
	chat_sdp_index = self._chat_sdp_index
	if chat_sdp_index == -1:
	chat_sdp_index = len(local_sdp.media)
	self.session_manager.msrp_chat_mapping[msrp_chat] = self
	local_sdp.media.append(msrp_chat.local_media)
	self._inv.set_offered_local_sdp(local_sdp)
	self._inv.send_reinvite()
	except SIPCoreError, e:
	self.proposed_chat = False
	self._cancel_media()
	self._change_state("ESTABLISHED")
	self.notification_center.post_notification("SCSessionRejectedStreamProposal", self, TimestampedNotificationData(proposer="local", reason=e.args[0]))
	finally:
	self._lock.release()

	def _init_audio(self, rtp_transport, remote_sdp=None):
	"""Initialize everything needed for an audio RTP stream and return a
	SDPMedia object describing it. Called internally."""
	if remote_sdp is None:
	self.audio_transport = AudioTransport(rtp_transport)
	else:
	self.audio_transport = AudioTransport(rtp_transport, remote_sdp, self._audio_sdp_index)
	self.session_manager.audio_transport_mapping[self.audio_transport] = self
	return self.audio_transport.get_local_media(remote_sdp is None)

	def _update_media(self, local_sdp, remote_sdp):
	"""Update the media stream(s) according to the newly negotiated SDP.
	This will start, stop or change the stream(s). Called by
	SessionManager."""
	if self.audio_transport:
	if local_sdp.media[self._audio_sdp_index].port and remote_sdp.media[self._audio_sdp_index].port:
	self._update_audio(local_sdp, remote_sdp)
	else:
	self._stop_audio()
	if self.chat_transport:
	if local_sdp.media[self._chat_sdp_index].port and remote_sdp.media[self._chat_sdp_index].port:
	self._update_chat(remote_sdp)
	else:
	self._stop_chat()

	def _update_audio(self, local_sdp, remote_sdp):
	"""Update the audio RTP stream. Will be called locally from
	_update_media()."""
	if self.audio_transport.is_active:
	# TODO: check for ip/port/codec changes and restart AudioTransport if needed
	pass
	else:
	self.audio_transport.start(local_sdp, remote_sdp, self._audio_sdp_index)
	Engine().connect_audio_transport(self.audio_transport)
	self._no_audio_timer = Timer(5, self._check_audio)
	self._no_audio_timer.start()
	was_on_hold = self.on_hold_by_remote
	new_direction = local_sdp.media[self._audio_sdp_index].get_direction()
	self.on_hold_by_remote = "send" not in new_direction
	self.audio_transport.update_direction(new_direction)
	if not was_on_hold and self.on_hold_by_remote:
	self._check_recording_hold()
	self.notification_center.post_notification("SCSessionGotHoldRequest", self, TimestampedNotificationData(originator="remote"))
	elif was_on_hold and not self.on_hold_by_remote:
	self._check_recording_hold()
	self.notification_center.post_notification("SCSessionGotUnholdRequest", self, TimestampedNotificationData(originator="remote"))

	def _update_chat(self, remote_sdp):
	if self.chat_transport.is_active:
	# TODO: what do we do with new SDP?
	pass
	else:
	self.chat_transport.start(remote_sdp.media[self._chat_sdp_index])

	def _stop_media(self):
	"""Stop all media streams. This will be called by SessionManager when
	the SIP session ends."""
	if self.audio_transport:
	self._stop_audio()
	if self.chat_transport:
	self._stop_chat()

	def _stop_audio(self):
	"""Stop the audio RTP stream. This will be called locally, either from
	_update_media() or _stop_media()."""
	if self.audio_transport.is_active:
	Engine().disconnect_audio_transport(self.audio_transport)
	self.audio_transport.stop()
	if self._no_audio_timer is not None:
	self._no_audio_timer.cancel()
	self._no_audio_timer = None
	if self._audio_rec is not None:
	self._stop_recording_audio()
	del self.session_manager.audio_transport_mapping[self.audio_transport]
	self.audio_transport = None

	def _stop_chat(self):
	self.chat_transport.end()

	def _check_audio(self):
	with self._lock:
	self._no_audio_timer = None
	if not self.audio_was_received:
	self.notification_center.post_notification("SCSessionGotNoAudio", self, TimestampedNotificationData())

	def _cancel_media(self):
	# This should, in principle, never throw exceptions
	if self.audio_transport is not None and not self.audio_transport.is_active:
	self._stop_audio()
	if self.chat_transport is not None and not self.chat_transport.is_active:
	self._stop_chat()

	def send_dtmf(self, digit):
	if self.audio_transport is None or not self.audio_transport.is_active:
	raise RuntimeError("This SIP session does not have an active audio RTP stream to transmit DMTF over")
	self.audio_transport.send_dtmf(digit)

	def _make_next_sdp(self, is_offer, on_hold=False):
	# This should, in principle, never throw exceptions
	local_sdp = self._inv.get_active_local_sdp()
	local_sdp.version += 1
	if self._audio_sdp_index != -1:
	if self.audio_transport is None:
	local_sdp.media[self._audio_sdp_index].port = 0
	else:
	if is_offer:
	if "send" in self.audio_transport.direction:
	direction = ("sendonly" if on_hold else "sendrecv")
	else:
	direction = ("inactive" if on_hold else "recvonly")
	else:
	direction = None
	local_sdp.media[self._audio_sdp_index] = self.audio_transport.get_local_media(is_offer, direction)
	if self._chat_sdp_index != -1 and self.chat_transport is None:
	local_sdp.media[self._chat_sdp_index].port = 0
	return local_sdp

	def send_message(self, content, content_type="text/plain", to_uri=None, dt=None):
	if self.chat_transport is None:
	raise RuntimeError("This SIP session does not have an active MSRP stream to send chat message over")
	return self.chat_transport.send_message(content, content_type, to_uri, dt=dt)


	class SessionManager(NotificationHandler):
	"""The one and only SessionManager, a singleton.
	The application needs to create this and then pass its handle_event
	method to the Engine as event_handler.
	Attributes:
	rtp_config: RTPConfiguration object
	inv_mapping: A dictionary mapping Invitation objects to Session
	objects."""
	__metaclass__ = Singleton
	implements(IObserver)

	def __init__(self):
	"""Creates a new SessionManager object."""
	self.inv_mapping = {}
	self.audio_transport_mapping = {}
	self.msrp_chat_mapping = {}
	self.notification_center = NotificationCenter()
	self.notification_center.add_observer(self, "SCInvitationChangedState")
	self.notification_center.add_observer(self, "SCInvitationGotSDPUpdate")
	self.notification_center.add_observer(self, "SCAudioTransportGotDTMF")
	self.notification_center.add_observer(self, "MSRPChatGotMessage")
	self.notification_center.add_observer(self, "MSRPChatDidDeliverMessage")
	self.notification_center.add_observer(self, "MSRPChatDidNotDeliverMessage")
	self.notification_center.add_observer(self, "MSRPChatDidEnd")

	@property
	def sessions(self):
	return self.inv_mapping.values()

	def _NH_SCInvitationChangedState(self, inv, data):
	if data.state == "INCOMING":
	if "To" not in data.headers.iterkeys():
	inv.disconnect(404)
	return
	to_uri = data.headers['To'][0]
	account = AccountManager().find_account(to_uri)
	if account is None or account.id.username != to_uri.user or account.id.domain != to_uri.host:
	inv.disconnect(404)
	return
	proposed_media = list(set(media.media for media in inv.get_offered_remote_sdp().media if media.media in ["audio", "message"] and media.port != 0))
	if len(proposed_media) == 0:
	inv.disconnect(415)
	return
	inv.respond_to_invite_provisionally(180)
	session = Session(account)
	session._inv = inv
	session.remote_user_agent = data.headers.get("User-Agent", None)
	self.inv_mapping[inv] = session
	ringtone = account.ringtone.inbound or SIPSimpleSettings().ringtone.inbound
	if ringtone is not None:
	session._ringtone = WaveFile(ringtone)
	session.direction = "incoming"
	session._change_state("INCOMING")
	self.notification_center.post_notification("SCSessionNewIncoming", session, TimestampedNotificationData(streams=proposed_media))
	else:
	session = self.inv_mapping.get(inv, None)
	if session is None:
	return
	with session._lock:
	prev_session_state = session.state
	if data.state == "EARLY" and inv.is_outgoing and hasattr(data, "code") and data.code == 180:
	if session._ringtone is not None and not session._ringtone.is_active:
	session._start_ringtone()
	self.notification_center.post_notification("SCSessionGotRingIndication", session, TimestampedNotificationData())
	elif data.state == "CONNECTING":
	session.start_time = datetime.now()
	self.notification_center.post_notification("SCSessionWillStart", session, TimestampedNotificationData())
	if inv.is_outgoing:
	session.remote_user_agent = data.headers.get("Server", None)
	if session.remote_user_agent is None:
	session.remote_user_agent = data.headers.get("User-Agent", None)
	elif data.state == "CONFIRMED":
	session._change_state("ESTABLISHED")
	if data.prev_state == "CONNECTING":
	self.notification_center.post_notification("SCSessionDidStart", session, TimestampedNotificationData())
	elif session.state == "PROPOSING":
	failure_reason = None
	if data.code / 100 == 2:
	if session.proposed_audio:
	if session.audio_transport is None or not session.audio_transport.is_active:
	failure_reason = "Audio SDP negotation failed"
	elif session.proposed_chat:
	if session.chat_transport is None or not session.chat_transport.is_active:
	failure_reason = "MSRP chat SDP negotation failed"
	if failure_reason is not None and session._sdpneg_failure_reason is not None:
	failure_reason += ": %s" % session._sdpneg_failure_reason
	else:
	failure_reason = "Proposal rejected with: %d %s" % (data.code, data.reason)
	if failure_reason is None:
	self.notification_center.post_notification("SCSessionAcceptedStreamProposal", session, TimestampedNotificationData(proposer="local"))
	else:
	session._cancel_media()
	self.notification_center.post_notification("SCSessionRejectedStreamProposal", session, TimestampedNotificationData(proposer="local", reason=failure_reason))
	if session._queue:
	session._process_queue()
	elif data.state == "REINVITED":
	current_remote_sdp = inv.get_active_remote_sdp()
	proposed_remote_sdp = inv.get_offered_remote_sdp()
	if proposed_remote_sdp.version == current_remote_sdp.version:
	if current_remote_sdp != proposed_remote_sdp:
	# same version, but not identical SDP
	inv.respond_to_reinvite(488)
	else:
	# same version, same SDP, respond with the already present local SDP
	inv.set_offered_local_sdp(inv.get_active_local_sdp())
	inv.respond_to_reinvite(200)
	elif proposed_remote_sdp.version == current_remote_sdp.version + 1:
	for attr in ["user", "id", "net_type", "address_type", "address"]:
	if getattr(proposed_remote_sdp, attr) != getattr(current_remote_sdp, attr):
	# difference in contents of o= line
	inv.respond_to_reinvite(488)
	return
	if len(proposed_remote_sdp.media) < len(current_remote_sdp.media):
	# reduction in number of media streams, don't accept
	inv.respond_to_reinvite(488)
	return
	add_audio, remove_audio, add_chat, remove_chat = False, False, False, False
	for sdp_index, media in enumerate(proposed_remote_sdp.media):
	if sdp_index == session._audio_sdp_index and session.audio_transport is not None:
	if media.media != "audio":
	inv.respond_to_reinvite(488)
	return
	if media.port == 0:
	remove_audio = True
	elif sdp_index == session._chat_sdp_index and session.audio_transport is not None:
	if media.media != "message":
	inv.respond_to_reinvite(488)
	return
	if media.port == 0:
	remove_chat = True
	elif media.media == "audio" and session.audio_transport is None and media.port != 0:
	add_audio = True
	elif media.media == "message" and session.chat_transport is None and media.port != 0:
	add_chat = True
	if any([add_audio, add_chat]):
	if any([remove_audio, remove_chat]):
	# We don't support adding AND removing a stream in the same proposal
	inv.respond_to_reinvite(488)
	return
	inv.respond_to_reinvite(180)
	session._change_state("PROPOSED")
	self.notification_center.post_notification("SCSessionGotStreamProposal", session, TimestampedNotificationData(streams=[stream for is_added, stream in zip([add_audio, add_chat], ["audio", "chat"]) if is_added], proposer="remote"))
	else:
	inv.set_offered_local_sdp(session._make_next_sdp(False))
	inv.respond_to_reinvite(200)
	else:
	# version increase is not exactly one more
	inv.respond_to_reinvite(488)
	elif data.state == "DISCONNECTED":
	if session.start_time is not None:
	session.stop_time = datetime.now()
	del self.inv_mapping[inv]
	if hasattr(data, "headers"):
	if session.remote_user_agent is None:
	session.remote_user_agent = data.headers.get("Server", None)
	if session.remote_user_agent is None:
	session.remote_user_agent = data.headers.get("User-Agent", None)
	try:
	session._stop_media()
	except SIPCoreError:
	traceback.print_exc()
	session._inv = None
	session._change_state("TERMINATED")
	if data.prev_state == "DISCONNECTING" or (hasattr(data, "code") and not hasattr(data, "headers")):
	originator = "local"
	else:
	originator = "remote"
	if prev_session_state != "TERMINATING" and data.prev_state != "CONFIRMED":
	failure_data = TimestampedNotificationData(originator=originator, code=0)
	if hasattr(data, "code"):
	failure_data.code = data.code
	if data.prev_state == "CONNECTING" and data.code == 408:
	failure_data.reason = "No ACK received"
	elif hasattr(data, "headers") and "Warning" in data.headers:
	failure_data.reason = "%s (%s)" % (data.reason, data.headers["Warning"][2])
	else:
	failure_data.reason = data.reason
	elif hasattr(data, "method") and data.method == "CANCEL":
	failure_data.reason = "Request cancelled"
	else:
	failure_data.reason = session._sdpneg_failure_reason
	self.notification_center.post_notification("SCSessionDidFail", session, failure_data)
	self.notification_center.post_notification("SCSessionDidEnd", session, TimestampedNotificationData(originator=originator))

	def _NH_SCInvitationGotSDPUpdate(self, inv, data):
	session = self.inv_mapping.get(inv, None)
	if session is None:
	return
	with session._lock:
	if data.succeeded:
	try:
	session._update_media(data.local_sdp, data.remote_sdp)
	session._sdpneg_failure_reason = None
	except SIPCoreError, e:
	# TODO: find a better way to deal with this
	session._do_fail(e.args[0])
	else:
	session._cancel_media()
	session._sdpneg_failure_reason = data.error

	def _NH_SCAudioTransportGotDTMF(self, audio_transport, data):
	session = self.audio_transport_mapping.get(audio_transport, None)
	if session is not None:
	self.notification_center.post_notification("SCSessionGotDTMF", session, data)

	def _NH_MSRPChatGotMessage(self, msrp_chat, data):
	session = self.msrp_chat_mapping.get(msrp_chat, None)
	if session is not None:
	self.notification_center.post_notification("SCSessionGotMessage", session, data)

	def _NH_MSRPChatDidDeliverMessage(self, msrp_chat, data):
	session = self.msrp_chat_mapping.get(msrp_chat, None)
	if session is not None:
	self.notification_center.post_notification("SCSessionDidDeliverMessage", session, data)

	def _NH_MSRPChatDidNotDeliverMessage(self, msrp_chat, data):
	session = self.msrp_chat_mapping.get(msrp_chat, None)
	if session is not None:
	self.notification_center.post_notification("SCSessionDidNotDeliverMessage", session, data)

	def _NH_MSRPChatDidEnd(self, msrp_chat, data):
	session = self.msrp_chat_mapping.get(msrp_chat, None)
	if session is not None:
	with session._lock:
	session.chat_transport = None
	del self.msrp_chat_mapping[msrp_chat]


	__all__ = ["SessionManager", "Session"]

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