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	diff --git a/sipsimple/core/_core.mediatransport.pxi b/sipsimple/core/_core.mediatransport.pxi
	index 7971f3b7..f6bc0491 100644
	--- a/sipsimple/core/_core.mediatransport.pxi
	+++ b/sipsimple/core/_core.mediatransport.pxi
	@@ -1,1319 +1,1319 @@
	# Copyright (C) 2008-2011 AG Projects. See LICENSE for details.
	#

	# python imports

	from errno import EADDRINUSE


	# classes

	cdef class RTPTransport:
	def __cinit__(self, args, *kwargs):
	cdef pj_pool_t *pool
	cdef pjsip_endpoint *endpoint
	cdef bytes pool_name
	cdef char* c_pool_name
	cdef PJSIPUA ua

	ua = _get_ua()
	endpoint = ua._pjsip_endpoint._obj
	pool_name = b"RTPTransport_%d" % id(self)
	c_pool_name = pool_name

	self.weakref = weakref.ref(self)
	Py_INCREF(self.weakref)

	self._af = pj_AF_INET()
	pj_mutex_create_recursive(ua._pjsip_endpoint._pool, "rtp_transport_lock", &self._lock)
	with nogil:
	pool = pjsip_endpt_create_pool(endpoint, c_pool_name, 4096, 4096)
	if pool == NULL:
	raise SIPCoreError("Could not allocate memory pool")
	self._pool = pool
	self.state = "NULL"

	def __init__(self, local_rtp_address=None, use_srtp=False, srtp_forced=False, use_ice=False,
	ice_stun_address=None, ice_stun_port=PJ_STUN_PORT):
	cdef PJSIPUA ua = _get_ua()

	if self.state != "NULL":
	raise SIPCoreError("RTPTransport.__init__() was already called")
	if local_rtp_address is not None and not _is_valid_ip(self._af, local_rtp_address):
	raise ValueError("Not a valid IPv4 address: %s" % local_rtp_address)
	self._local_rtp_addr = local_rtp_address
	self._rtp_valid_pair = None
	self.use_srtp = use_srtp
	self.srtp_forced = srtp_forced
	self.use_ice = use_ice
	self.ice_stun_address = ice_stun_address
	self.ice_stun_port = ice_stun_port

	def __dealloc__(self):
	cdef PJSIPUA ua
	cdef pjsip_endpoint *endpoint
	cdef pjmedia_transport *transport
	cdef pjmedia_transport *wrapped_transport
	cdef pj_pool_t *pool
	cdef Timer timer

	try:
	ua = _get_ua()
	except SIPCoreError:
	return
	endpoint = ua._pjsip_endpoint._obj
	pool = self._pool
	transport = self._obj
	wrapped_transport = self._wrapped_transport

	if self.state in ["LOCAL", "ESTABLISHED"]:
	with nogil:
	pjmedia_transport_media_stop(transport)
	if self._obj != NULL:
	with nogil:
	pjmedia_transport_close(transport)
	if self._obj.type == PJMEDIA_TRANSPORT_TYPE_ICE:
	(<void **> (self._obj.name + 1))[0] = NULL
	if self._wrapped_transport != NULL:
	if self._wrapped_transport.type == PJMEDIA_TRANSPORT_TYPE_ICE:
	(<void **> (self._obj.name + 1))[0] = NULL
	self._wrapped_transport = NULL
	self._obj = NULL
	if self._wrapped_transport != NULL:
	if self._wrapped_transport.type == PJMEDIA_TRANSPORT_TYPE_ICE:
	(<void **> (self._obj.name + 1))[0] = NULL
	with nogil:
	pjmedia_transport_close(wrapped_transport)
	if self._pool != NULL:
	with nogil:
	pjsip_endpt_release_pool(endpoint, pool)

	timer = Timer()
	try:
	timer.schedule(60, deallocate_weakref, self.weakref)
	except SIPCoreError:
	pass

	cdef PJSIPUA _check_ua(self):
	cdef PJSIPUA ua
	try:
	ua = _get_ua()
	return ua
	except:
	self.state = "INVALID"
	self._obj = NULL
	self._wrapped_transport = NULL
	self._pool = NULL
	return None

	cdef void _get_info(self, pjmedia_transport_info *info):
	cdef int status
	cdef pjmedia_transport *transport

	transport = self._obj

	with nogil:
	pjmedia_transport_info_init(info)
	status = pjmedia_transport_get_info(transport, info)
	if status != 0:
	raise PJSIPError("Could not get transport info", status)

	property local_rtp_port:

	def __get__(self):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_transport_info info
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self.state in ["NULL", "WAIT_STUN", "INVALID"]:
	return None
	self._get_info(&info)
	if pj_sockaddr_has_addr(&info.sock_info.rtp_addr_name):
	return pj_sockaddr_get_port(&info.sock_info.rtp_addr_name)
	else:
	return None
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property local_rtp_address:

	def __get__(self):
	cdef char buf[PJ_INET6_ADDRSTRLEN]
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_transport_info info
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self.state in ["NULL", "WAIT_STUN", "INVALID"]:
	return None
	self._get_info(&info)
	if pj_sockaddr_has_addr(&info.sock_info.rtp_addr_name):
	return pj_sockaddr_print(&info.sock_info.rtp_addr_name, buf, PJ_INET6_ADDRSTRLEN, 0)
	else:
	return None
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property local_rtp_candidate:

	def __get__(self):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self._rtp_valid_pair:
	return self._rtp_valid_pair.local_candidate
	return None
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property remote_rtp_port:

	def __get__(self):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_transport_info info
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self.state in ["NULL", "WAIT_STUN", "INVALID"]:
	return None
	if self._ice_active and self._rtp_valid_pair:
	return self._rtp_valid_pair.remote_candidate.port
	self._get_info(&info)
	if pj_sockaddr_has_addr(&info.src_rtp_name):
	return pj_sockaddr_get_port(&info.src_rtp_name)
	else:
	return None
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property remote_rtp_address:

	def __get__(self):
	cdef char buf[PJ_INET6_ADDRSTRLEN]
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_transport_info info
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self.state in ["NULL", "WAIT_STUN", "INVALID"]:
	return None
	if self._ice_active and self._rtp_valid_pair:
	return self._rtp_valid_pair.remote_candidate.address
	self._get_info(&info)
	if pj_sockaddr_has_addr(&info.src_rtp_name):
	return pj_sockaddr_print(&info.src_rtp_name, buf, PJ_INET6_ADDRSTRLEN, 0)
	else:
	return None
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property remote_rtp_candidate:

	def __get__(self):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self._rtp_valid_pair:
	return self._rtp_valid_pair.remote_candidate
	return None
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property srtp_active:

	def __get__(self):
	cdef int i
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_srtp_info *srtp_info
	cdef pjmedia_transport_info info
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return False

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if self.state in ["NULL", "WAIT_STUN", "INVALID"]:
	return False
	self._get_info(&info)
	for i from 0 <= i < info.specific_info_cnt:
	if info.spc_info[i].type == PJMEDIA_TRANSPORT_TYPE_SRTP:
	srtp_info = <pjmedia_srtp_info *> info.spc_info[i].buffer
	return bool(srtp_info.active)
	return False
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property ice_active:

	def __get__(self):
	return bool(self._ice_active)

	cdef int _update_local_sdp(self, SDPSession local_sdp, int sdp_index, pjmedia_sdp_session *remote_sdp) except -1:
	cdef int status
	cdef pj_pool_t *pool
	cdef pjmedia_sdp_session *pj_local_sdp
	cdef pjmedia_transport *transport

	pj_local_sdp = local_sdp.get_sdp_session()
	pool = self._pool
	transport = self._obj

	if sdp_index < 0:
	raise ValueError("sdp_index argument cannot be negative")
	if sdp_index >= local_sdp.get_sdp_session().media_count:
	raise ValueError("sdp_index argument out of range")
	with nogil:
	status = pjmedia_transport_media_create(transport, pool, 0, remote_sdp, sdp_index)
	if status != 0:
	raise PJSIPError("Could not create media transport", status)
	with nogil:
	status = pjmedia_transport_encode_sdp(transport, pool, pj_local_sdp, remote_sdp, sdp_index)
	if status != 0:
	raise PJSIPError("Could not update SDP for media transport", status)
	local_sdp._update()
	return 0

	def set_LOCAL(self, SDPSession local_sdp, int sdp_index):
	cdef int status
	cdef pj_mutex_t *lock = self._lock

	_get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if local_sdp is None:
	raise SIPCoreError("local_sdp argument cannot be None")
	if self.state == "LOCAL":
	return
	if self.state != "INIT":
	raise SIPCoreError('set_LOCAL can only be called in the "INIT" state, current state is "%s"' % self.state)
	self._update_local_sdp(local_sdp, sdp_index, NULL)
	self.state = "LOCAL"
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	def set_REMOTE(self, BaseSDPSession local_sdp, BaseSDPSession remote_sdp, int sdp_index):
	cdef int status
	cdef pjmedia_sdp_session *pj_remote_sdp
	cdef pj_mutex_t *lock = self._lock

	_get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if None in [local_sdp, remote_sdp]:
	raise SIPCoreError("SDP arguments cannot be None")
	if self.state == "REMOTE":
	return
	if self.state != "INIT":
	raise SIPCoreError('set_REMOTE can only be called in the "INIT" state, current state is "%s"' % self.state)
	pj_remote_sdp = remote_sdp.get_sdp_session()
	self._update_local_sdp(local_sdp, sdp_index, pj_remote_sdp)
	self.state = "REMOTE"
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	def set_ESTABLISHED(self, BaseSDPSession local_sdp, BaseSDPSession remote_sdp, int sdp_index):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_sdp_session *pj_local_sdp
	cdef pjmedia_sdp_session *pj_remote_sdp
	cdef pjmedia_transport *transport = self._obj

	_get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	transport = self._obj

	if None in [local_sdp, remote_sdp]:
	raise SIPCoreError("SDP arguments cannot be None")
	pj_local_sdp = local_sdp.get_sdp_session()
	pj_remote_sdp = remote_sdp.get_sdp_session()
	if self.state == "ESTABLISHED":
	return
	if self.state not in ["LOCAL", "REMOTE"]:
	raise SIPCoreError('set_ESTABLISHED can only be called in the "INIT" and "LOCAL" states, ' +
	'current state is "%s"' % self.state)
	with nogil:
	status = pjmedia_transport_media_start(transport, self._pool, pj_local_sdp, pj_remote_sdp, sdp_index)
	if status != 0:
	raise PJSIPError("Could not start media transport", status)
	self.state = "ESTABLISHED"
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	def set_INIT(self):
	global _ice_cb
	cdef int af
	cdef int i
	cdef int status
	cdef int port
	cdef pj_caching_pool *caching_pool
	cdef pj_ice_strans_cfg ice_cfg
	cdef pj_mutex_t *lock = self._lock
	cdef pj_str_t local_ip
	cdef pj_str_t *local_ip_address
	cdef pjmedia_endpt *media_endpoint
	cdef pjmedia_srtp_setting srtp_setting
	cdef pjmedia_transport **transport_address
	cdef pjmedia_transport *wrapped_transport
	cdef pjsip_endpoint *sip_endpoint
	cdef PJSIPUA ua

	ua = _get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	af = self._af
	caching_pool = &ua._caching_pool._obj
	media_endpoint = ua._pjmedia_endpoint._obj
	sip_endpoint = ua._pjsip_endpoint._obj
	transport_address = &self._obj

	if self.state == "INIT":
	return
	if self.state in ["LOCAL", "ESTABLISHED"]:
	with nogil:
	status = pjmedia_transport_media_stop(transport_address[0])
	if status != 0:
	raise PJSIPError("Could not stop media transport", status)
	self.state = "INIT"
	elif self.state == "NULL":
	if self._local_rtp_addr is None:
	local_ip_address = NULL
	else:
	_str_to_pj_str(self._local_rtp_addr, &local_ip)
	local_ip_address = &local_ip
	if self.use_ice:
	with nogil:
	pj_ice_strans_cfg_default(&ice_cfg)
	ice_cfg.af = self._af
	with nogil:
	pj_stun_config_init(&ice_cfg.stun_cfg, &caching_pool.factory, 0,
	pjmedia_endpt_get_ioqueue(media_endpoint),
	pjsip_endpt_get_timer_heap(sip_endpoint))
	if self.ice_stun_address is not None:
	_str_to_pj_str(self.ice_stun_address, &ice_cfg.stun.server)
	ice_cfg.stun.port = self.ice_stun_port
	# IIRC we can't choose the port for ICE
	with nogil:
	status = pj_sockaddr_init(ice_cfg.af, &ice_cfg.stun.cfg.bound_addr, local_ip_address, 0)
	if status != 0:
	raise PJSIPError("Could not init ICE bound address", status)
	with nogil:
	status = pjmedia_ice_create2(media_endpoint, NULL, 2, &ice_cfg, &_ice_cb, 0, transport_address)
	if status != 0:
	raise PJSIPError("Could not create ICE media transport", status)
	(<void *> (self._obj.name + 1))[0] = <void > self.weakref
	else:
	status = PJ_EBUG
	for i in xrange(ua._rtp_port_index, ua._rtp_port_index + ua._rtp_port_usable_count, 2):
	port = ua._rtp_port_start + i % ua._rtp_port_usable_count
	with nogil:
	status = pjmedia_transport_udp_create3(media_endpoint, af, NULL, local_ip_address,
	port, 0, transport_address)
	if status != PJ_ERRNO_START_SYS + EADDRINUSE:
	ua._rtp_port_index = (i + 2) % ua._rtp_port_usable_count
	break
	if status != 0:
	raise PJSIPError("Could not create UDP/RTP media transport", status)
	if self.use_srtp:
	wrapped_transport = self._wrapped_transport = self._obj
	self._obj = NULL
	with nogil:
	pjmedia_srtp_setting_default(&srtp_setting)
	if self.srtp_forced:
	srtp_setting.use = PJMEDIA_SRTP_MANDATORY
	with nogil:
	status = pjmedia_transport_srtp_create(media_endpoint, wrapped_transport, &srtp_setting, transport_address)
	if status != 0:
	with nogil:
	pjmedia_transport_close(wrapped_transport)
	self._wrapped_transport = NULL
	raise PJSIPError("Could not create SRTP media transport", status)
	if not self.use_ice or self.ice_stun_address is None:
	self.state = "INIT"
	_add_event("RTPTransportDidInitialize", dict(obj=self))
	else:
	self.state = "WAIT_STUN"
	else:
	raise SIPCoreError('set_INIT can only be called in the "NULL", "LOCAL" and "ESTABLISHED" states, ' +
	'current state is "%s"' % self.state)
	finally:
	with nogil:
	pj_mutex_unlock(lock)


	cdef class MediaCheckTimer(Timer):
	def __init__(self, media_check_interval):
	self.media_check_interval = media_check_interval


	cdef class AudioTransport:
	def __cinit__(self, args, *kwargs):
	cdef pj_pool_t *pool
	cdef pjsip_endpoint *endpoint
	cdef bytes pool_name
	cdef char* c_pool_name
	cdef PJSIPUA ua

	ua = _get_ua()
	endpoint = ua._pjsip_endpoint._obj
	pool_name = b"AudioTransport_%d" % id(self)
	c_pool_name = pool_name

	self.weakref = weakref.ref(self)
	Py_INCREF(self.weakref)

	pj_mutex_create_recursive(ua._pjsip_endpoint._pool, "audio_transport_lock", &self._lock)
	with nogil:
	pool = pjsip_endpt_create_pool(endpoint, c_pool_name, 4096, 4096)
	if pool == NULL:
	raise SIPCoreError("Could not allocate memory pool")
	self._pool = pool
	self._slot = -1
	self._timer = None
	self._volume = 100

	def __init__(self, AudioMixer mixer, RTPTransport transport,
	BaseSDPSession remote_sdp=None, int sdp_index=0, enable_silence_detection=False, list codecs=None):
	cdef int status
	cdef pj_pool_t *pool
	cdef pjmedia_endpt *media_endpoint
	cdef pjmedia_sdp_media *local_media
	cdef pjmedia_sdp_session *local_sdp_c
	cdef pjmedia_transport_info info
	cdef list global_codecs
	cdef SDPSession local_sdp
	cdef PJSIPUA ua

	ua = _get_ua()
	media_endpoint = ua._pjmedia_endpoint._obj
	pool = self._pool

	if self.transport is not None:
	raise SIPCoreError("AudioTransport.__init__() was already called")
	if mixer is None:
	raise ValueError("mixer argument may not be None")
	if transport is None:
	raise ValueError("transport argument cannot be None")
	if sdp_index < 0:
	raise ValueError("sdp_index argument cannot be negative")
	if transport.state != "INIT":
	raise SIPCoreError('RTPTransport object provided is not in the "INIT" state, but in the "%s" state' %
	transport.state)
	self._vad = int(bool(enable_silence_detection))
	self.mixer = mixer
	self.transport = transport
	transport._get_info(&info)
	global_codecs = ua._pjmedia_endpoint._get_current_codecs()
	if codecs is None:
	codecs = global_codecs
	try:
	ua._pjmedia_endpoint._set_codecs(codecs)
	with nogil:
	status = pjmedia_endpt_create_sdp(media_endpoint, pool, 1, &info.sock_info, &local_sdp_c)
	if status != 0:
	raise PJSIPError("Could not generate SDP for audio session", status)
	finally:
	ua._pjmedia_endpoint._set_codecs(global_codecs)
	local_sdp = SDPSession_create(local_sdp_c)
	if remote_sdp is None:
	self._is_offer = 1
	self.transport.set_LOCAL(local_sdp, 0)
	else:
	self._is_offer = 0
	if sdp_index != 0:
	local_sdp.media = (sdp_index+1) * local_sdp.media
	self.transport.set_REMOTE(local_sdp, remote_sdp, sdp_index)
	local_sdp_c = local_sdp.get_sdp_session()
	with nogil:
	local_media = pjmedia_sdp_media_clone(pool, local_sdp_c.media[sdp_index])
	self._local_media = local_media

	def __dealloc__(self):
	cdef PJSIPUA ua
	cdef Timer timer
	try:
	ua = _get_ua()
	except SIPCoreError:
	return
	cdef pjsip_endpoint *endpoint = ua._pjsip_endpoint._obj
	cdef pj_pool_t *pool = self._pool
	if self._obj != NULL:
	self.stop()
	if self._pool != NULL:
	with nogil:
	pjsip_endpt_release_pool(endpoint, pool)

	timer = Timer()
	try:
	timer.schedule(60, deallocate_weakref, self.weakref)
	except SIPCoreError:
	pass

	cdef PJSIPUA _check_ua(self):
	cdef PJSIPUA ua
	try:
	ua = _get_ua()
	return ua
	except:
	self._obj = NULL
	self._pool = NULL
	return None

	property is_active:

	def __get__(self):
	self._check_ua()
	return bool(self._obj != NULL)

	property is_started:

	def __get__(self):
	return bool(self._is_started)

	property codec:

	def __get__(self):
	self._check_ua()
	if self._obj == NULL:
	return None
	else:
	return _pj_str_to_str(self._stream_info.fmt.encoding_name)

	property sample_rate:

	def __get__(self):
	self._check_ua()
	if self._obj == NULL:
	return None
	else:
	return self._stream_info.fmt.clock_rate

	property enable_silence_detection:

	def __get__(self):
	return bool(self._vad)

	property statistics:

	def __get__(self):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_rtcp_stat stat
	cdef pjmedia_stream *stream
	cdef dict statistics = dict()
	cdef PJSIPUA ua

	ua = self._check_ua()
	if ua is None:
	return None

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	stream = self._obj

	if self._cached_statistics is not None:
	return self._cached_statistics.copy()
	if self._obj == NULL:
	return None
	with nogil:
	status = pjmedia_stream_get_stat(stream, &stat)
	if status != 0:
	raise PJSIPError("Could not get RTP statistics", status)
	statistics["rtt"] = _pj_math_stat_to_dict(&stat.rtt)
	statistics["rx"] = _pjmedia_rtcp_stream_stat_to_dict(&stat.rx)
	statistics["tx"] = _pjmedia_rtcp_stream_stat_to_dict(&stat.tx)
	return statistics
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	property volume:

	def __get__(self):
	return self._volume

	def __set__(self, value):
	cdef int slot
	cdef int status
	cdef int volume
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_conf *conf_bridge
	cdef PJSIPUA ua

	ua = self._check_ua()

	if ua is not None:
	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	conf_bridge = self.mixer._obj
	slot = self._slot

	if value < 0:
	raise ValueError("volume attribute cannot be negative")
	if ua is not None and self._obj != NULL:
	volume = int(value * 1.28 - 128)
	with nogil:
	status = pjmedia_conf_adjust_rx_level(conf_bridge, slot, volume)
	if status != 0:
	raise PJSIPError("Could not set volume of audio transport", status)
	self._volume = value
	finally:
	if ua is not None:
	with nogil:
	pj_mutex_unlock(lock)

	property slot:

	def __get__(self):
	self._check_ua()
	if self._slot == -1:
	return None
	else:
	return self._slot

	def get_local_media(self, is_offer, direction="sendrecv"):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef object direction_attr
	cdef SDPAttribute attr
	cdef SDPMediaStream local_media

	_get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	if is_offer and direction not in ["sendrecv", "sendonly", "recvonly", "inactive"]:
	raise SIPCoreError("Unknown direction: %s" % direction)
	local_media = SDPMediaStream_create(self._local_media)
	local_media.attributes = [<object> attr for attr in local_media.attributes if attr.name not in ["sendrecv",
	"sendonly",
	"recvonly",
	"inactive"]]
	if is_offer:
	direction_attr = direction
	else:
	if self.direction is None or "recv" in self.direction:
	direction_attr = "sendrecv"
	else:
	direction_attr = "sendonly"
	local_media.attributes.append(SDPAttribute(direction_attr, ""))
	for attribute in local_media.attributes:
	if attribute.name == 'rtcp':
	attribute.value = attribute.value.split(' ', 1)[0]
	return local_media
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	def start(self, BaseSDPSession local_sdp, BaseSDPSession remote_sdp, int sdp_index, int timeout=30):
	cdef int status
	cdef object desired_state
	cdef pj_mutex_t *lock = self._lock
	cdef pj_pool_t *pool
	cdef pjmedia_endpt *media_endpoint
	cdef pjmedia_port *media_port
	cdef pjmedia_sdp_media *local_media
	cdef pjmedia_sdp_session *pj_local_sdp
	cdef pjmedia_sdp_session *pj_remote_sdp
	cdef pjmedia_stream **stream_address
	cdef pjmedia_stream_info *stream_info_address
	cdef pjmedia_transport *transport
	cdef PJSIPUA ua

	ua = _get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	pool = self._pool
	media_endpoint = ua._pjmedia_endpoint._obj
	stream_address = &self._obj
	stream_info_address = &self._stream_info
	transport = self.transport._obj

	if self._is_started:
	raise SIPCoreError("This AudioTransport was already started once")
	desired_state = ("LOCAL" if self._is_offer else "REMOTE")
	if self.transport.state != desired_state:
	raise SIPCoreError('RTPTransport object provided is not in the "%s" state, but in the "%s" state' %
	(desired_state, self.transport.state))
	if None in [local_sdp, remote_sdp]:
	raise ValueError("SDP arguments cannot be None")
	pj_local_sdp = local_sdp.get_sdp_session()
	pj_remote_sdp = remote_sdp.get_sdp_session()
	if sdp_index < 0:
	raise ValueError("sdp_index argument cannot be negative")
	if local_sdp.media[sdp_index].port == 0 or remote_sdp.media[sdp_index].port == 0:
	raise SIPCoreError("Cannot start a rejected audio stream")
	if timeout < 0:
	raise ValueError("timeout value cannot be negative")
	self.transport.set_ESTABLISHED(local_sdp, remote_sdp, sdp_index)
	with nogil:
	status = pjmedia_stream_info_from_sdp(stream_info_address, pool, media_endpoint,
	pj_local_sdp, pj_remote_sdp, sdp_index)
	if status != 0:
	raise PJSIPError("Could not parse SDP for audio session", status)
	if self._stream_info.param == NULL:
	raise SIPCoreError("Could not parse SDP for audio session")
	self._stream_info.param.setting.vad = self._vad
	with nogil:
	status = pjmedia_stream_create(media_endpoint, pool, stream_info_address,
	transport, NULL, stream_address)
	if status != 0:
	raise PJSIPError("Could not initialize RTP for audio session", status)
	with nogil:
	status = pjmedia_stream_set_dtmf_callback(stream_address[0], _AudioTransport_cb_dtmf, <void *> self.weakref)
	if status != 0:
	with nogil:
	pjmedia_stream_destroy(stream_address[0])
	self._obj = NULL
	raise PJSIPError("Could not set DTMF callback for audio session", status)
	with nogil:
	status = pjmedia_stream_start(stream_address[0])
	if status != 0:
	with nogil:
	pjmedia_stream_destroy(stream_address[0])
	self._obj = NULL
	raise PJSIPError("Could not start RTP for audio session", status)
	with nogil:
	status = pjmedia_stream_get_port(stream_address[0], &media_port)
	if status != 0:
	with nogil:
	pjmedia_stream_destroy(stream_address[0])
	self._obj = NULL
	raise PJSIPError("Could not get audio port for audio session", status)
	try:
	self._slot = self.mixer._add_port(ua, pool, media_port)
	if self._volume != 100:
	self.volume = self._volume
	except:
	with nogil:
	pjmedia_stream_destroy(stream_address[0])
	self._obj = NULL
	raise
	self.update_direction(local_sdp.media[sdp_index].direction)
	with nogil:
	local_media = pjmedia_sdp_media_clone(pool, pj_local_sdp.media[sdp_index])
	self._local_media = local_media
	self._is_started = 1
	if timeout > 0:
	self._timer = MediaCheckTimer(timeout)
	self._timer.schedule(timeout, <timer_callback>self._cb_check_rtp, self)
	self.mixer.reset_ec()
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	def stop(self):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_stream *stream
	cdef PJSIPUA ua

	ua = self._check_ua()

	if ua is not None:
	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	stream = self._obj

	if self._timer is not None:
	self._timer.cancel()
	self._timer = None
	if self._obj == NULL:
	return
	self.mixer._remove_port(ua, self._slot)
	self._cached_statistics = self.statistics
	with nogil:
	pjmedia_stream_destroy(stream)
	self._obj = NULL
	self.transport.set_INIT()
	finally:
	if ua is not None:
	with nogil:
	pj_mutex_unlock(lock)

	def update_direction(self, direction):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_stream *stream

	_get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	stream = self._obj

	if self._obj == NULL:
	raise SIPCoreError("Stream is not active")
	if direction not in ["sendrecv", "sendonly", "recvonly", "inactive"]:
	raise SIPCoreError("Unknown direction: %s" % direction)
	self.mixer.reset_ec()
	self.direction = direction
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	def send_dtmf(self, digit):
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pj_str_t digit_pj
	cdef pjmedia_stream *stream
	cdef PJSIPUA ua

	ua = _get_ua()

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	stream = self._obj

	if self._obj == NULL:
	raise SIPCoreError("Stream is not active")
	if len(digit) != 1 or digit not in "0123456789*#ABCD":
	raise SIPCoreError("Not a valid DTMF digit: %s" % digit)
	_str_to_pj_str(digit, &digit_pj)
	if not self._stream_info.tx_event_pt < 0:
	# If the remote doesn't support telephone-event just don't send DTMF
	with nogil:
	status = pjmedia_stream_dial_dtmf(stream, &digit_pj)
	if status != 0:
	raise PJSIPError("Could not send DTMF digit on audio stream", status)
	finally:
	with nogil:
	pj_mutex_unlock(lock)

	cdef int _cb_check_rtp(self, MediaCheckTimer timer) except -1 with gil:
	cdef int status
	cdef pj_mutex_t *lock = self._lock
	cdef pjmedia_rtcp_stat stat
	cdef pjmedia_stream *stream

	with nogil:
	status = pj_mutex_lock(lock)
	if status != 0:
	raise PJSIPError("failed to acquire lock", status)
	try:
	stream = self._obj
	if stream == NULL:
	return 0

	if self._timer is None:
	return 0
	self._timer = None
	with nogil:
	status = pjmedia_stream_get_stat(stream, &stat)
	if status == 0:
	if self._packets_received == stat.rx.pkt and self.direction == "sendrecv":
	_add_event("RTPAudioTransportDidTimeout", dict(obj=self))
	self._packets_received = stat.rx.pkt
	if timer.media_check_interval > 0:
	self._timer = MediaCheckTimer(timer.media_check_interval)
	self._timer.schedule(timer.media_check_interval, <timer_callback>self._cb_check_rtp, self)
	finally:
	with nogil:
	pj_mutex_unlock(lock)


	cdef class ICECandidate:
	def __init__(self, component, cand_type, address, port, priority, rel_addr=''):
	self.component = component
	self.type = cand_type
	self.address = address
	self.port = port
	self.priority = priority
	self.rel_address = rel_addr

	def __str__(self):
	return '(%s) %s:%d%s priority=%d type=%s' % (self.component,
	self.address,
	self.port,
	' rel_addr=%s' % self.rel_address if self.rel_address else '',
	self.priority,
	- self.type)
	+ self.type.lower())

	cdef ICECandidate ICECandidate_create(pj_ice_sess_cand *cand):
	cdef char buf[PJ_INET6_ADDRSTRLEN]
	cdef str address
	cdef str cand_type
	cdef int port

	if cand.type == PJ_ICE_CAND_TYPE_HOST:
	cand_type = 'HOST'
	elif cand.type == PJ_ICE_CAND_TYPE_SRFLX:
	cand_type = 'SRFLX'
	elif cand.type == PJ_ICE_CAND_TYPE_PRFLX:
	cand_type = 'PRFLX'
	elif cand.type == PJ_ICE_CAND_TYPE_RELAYED:
	cand_type = 'RELAY'
	else:
	cand_type = 'UNKNOWN'

	pj_sockaddr_print(&cand.addr, buf, PJ_INET6_ADDRSTRLEN, 0)
	address = PyString_FromString(buf)
	port = pj_sockaddr_get_port(&cand.addr)
	if pj_sockaddr_has_addr(&cand.rel_addr):
	pj_sockaddr_print(&cand.rel_addr, buf, PJ_INET6_ADDRSTRLEN, 0)
	rel_addr = PyString_FromString(buf)
	else:
	rel_addr = ''

	return ICECandidate('RTP' if cand.comp_id==1 else 'RTCP', cand_type, address, port, cand.prio, rel_addr)


	cdef class ICECheck:
	def __init__(self, local_candidate, remote_candidate, state, nominated):
	self.local_candidate = local_candidate
	self.remote_candidate = remote_candidate
	self.state = state
	self.nominated = nominated

	def __str__(self):
	return '%s:%d -> %s:%d (%s, %s)' % (self.local_candidate.address, self.local_candidate.port,
	self.remote_candidate.address, self.remote_candidate.port,
	- self.state, 'nominated' if self.nominated else 'not nominated')
	+ self.state.lower(), 'nominated' if self.nominated else 'not nominated')

	cdef ICECheck ICECheck_create(pj_ice_sess_check *check):
	cdef str state
	cdef ICECandidate lcand
	cdef ICECandidate rcand

	if check.state == PJ_ICE_SESS_CHECK_STATE_FROZEN:
	state = 'FROZEN'
	elif check.state == PJ_ICE_SESS_CHECK_STATE_WAITING:
	state = 'WAITING'
	elif check.state == PJ_ICE_SESS_CHECK_STATE_IN_PROGRESS:
	state = 'IN_PROGRESS'
	elif check.state == PJ_ICE_SESS_CHECK_STATE_SUCCEEDED:
	state = 'SUCCEEDED'
	elif check.state == PJ_ICE_SESS_CHECK_STATE_FAILED:
	state = 'FAILED'
	else:
	state = 'UNKNOWN'

	lcand = ICECandidate_create(check.lcand)
	rcand = ICECandidate_create(check.rcand)

	return ICECheck(lcand, rcand, state, bool(check.nominated))

	cdef ICECheck _get_rtp_valid_pair(pj_ice_strans *ice_st):
	cdef pj_ice_sess_check_ptr_const ice_check

	ice_check = pj_ice_strans_get_valid_pair(ice_st, 1)
	if ice_check == NULL:
	return None
	return ICECheck_create(<pj_ice_sess_check*>ice_check)


	# helper functions

	cdef dict _pj_math_stat_to_dict(pj_math_stat *stat):
	cdef dict retval = dict()
	retval["count"] = stat.n
	retval["max"] = stat.max
	retval["min"] = stat.min
	retval["last"] = stat.last
	retval["avg"] = stat.mean
	return retval

	cdef dict _pjmedia_rtcp_stream_stat_to_dict(pjmedia_rtcp_stream_stat *stream_stat):
	cdef dict retval = dict()
	retval["packets"] = stream_stat.pkt
	retval["bytes"] = stream_stat.bytes
	retval["packets_discarded"] = stream_stat.discard
	retval["packets_lost"] = stream_stat.loss
	retval["packets_reordered"] = stream_stat.reorder
	retval["packets_duplicate"] = stream_stat.dup
	retval["loss_period"] = _pj_math_stat_to_dict(&stream_stat.loss_period)
	retval["burst_loss"] = bool(stream_stat.loss_type.burst)
	retval["random_loss"] = bool(stream_stat.loss_type.random)
	retval["jitter"] = _pj_math_stat_to_dict(&stream_stat.jitter)
	return retval

	cdef str _ice_state_to_str(int state):
	if state == PJ_ICE_STRANS_STATE_NULL:
	return 'NULL'
	elif state == PJ_ICE_STRANS_STATE_INIT:
	return 'GATHERING'
	elif state == PJ_ICE_STRANS_STATE_READY:
	return 'GATHERING_COMPLETE'
	elif state == PJ_ICE_STRANS_STATE_SESS_READY:
	return 'NEGOTIATION_START'
	elif state == PJ_ICE_STRANS_STATE_NEGO:
	return 'NEGOTIATING'
	elif state == PJ_ICE_STRANS_STATE_RUNNING:
	return 'RUNNING'
	elif state == PJ_ICE_STRANS_STATE_FAILED:
	return 'FAILED'
	else:
	return 'UNKNOWN'

	cdef dict _extract_ice_session_data(pj_ice_sess *ice_sess):
	cdef dict data = dict()
	cdef pj_ice_sess_cand *cand
	cdef pj_ice_sess_check *check

	# Process local candidates
	local_candidates = []
	for i in range(ice_sess.lcand_cnt):
	cand = &ice_sess.lcand[i]
	local_candidates.append(ICECandidate_create(cand))
	data['local_candidates'] = local_candidates

	# Process remote candidates
	remote_candidates = []
	for i in range(ice_sess.rcand_cnt):
	cand = &ice_sess.rcand[i]
	remote_candidates.append(ICECandidate_create(cand))
	data['remote_candidates'] = remote_candidates

	# Process valid pairs
	valid_pairs = []
	for i in range(ice_sess.comp_cnt):
	check = ice_sess.comp[i].valid_check
	valid_pairs.append(ICECheck_create(check))
	data['valid_pairs'] = valid_pairs

	# Process valid list
	valid_list = []
	for i in range(ice_sess.valid_list.count):
	check = &ice_sess.valid_list.checks[i]
	valid_list.append(ICECheck_create(check))
	data['valid_list'] = valid_list

	return data

	# callback functions

	cdef void _RTPTransport_cb_ice_complete(pjmedia_transport *tp, pj_ice_strans_op op, int status) with gil:
	# Despite the name this callback is not only called when ICE negotiation ends, it depends on the
	# op parameter
	cdef void *rtp_transport_void = NULL
	cdef double duration
	cdef pj_ice_strans *ice_st
	cdef pj_ice_sess *ice_sess
	cdef pj_time_val tv, start_time
	cdef RTPTransport rtp_transport
	cdef PJSIPUA ua
	try:
	ua = _get_ua()
	except:
	return
	try:
	if tp != NULL:
	rtp_transport_void = (<void **> (tp.name + 1))[0]
	if rtp_transport_void != NULL:
	rtp_transport = (<object> rtp_transport_void)()
	if rtp_transport is None:
	return
	if op == PJ_ICE_STRANS_OP_NEGOTIATION:
	ice_st = pjmedia_ice_get_strans(tp)
	if ice_st == NULL:
	return
	if status == 0:
	ice_sess = pj_ice_strans_get_session(ice_st)
	if ice_sess == NULL:
	return
	start_time = pj_ice_strans_get_start_time(ice_st)
	pj_gettimeofday(&tv)
	tv.sec -= start_time.sec
	tv.msec -= start_time.msec
	pj_time_val_normalize(&tv)
	duration = (tv.sec*1000 + tv.msec)/1000.0
	data = _extract_ice_session_data(ice_sess)
	rtp_transport._ice_active = 1
	rtp_transport._rtp_valid_pair = _get_rtp_valid_pair(ice_st)
	_add_event("RTPTransportICENegotiationDidSucceed", dict(obj=rtp_transport,
	duration=duration,
	local_candidates=data['local_candidates'],
	remote_candidates=data['remote_candidates'],
	valid_pairs=data['valid_pairs'],
	valid_list=data['valid_list']))
	else:
	rtp_transport._rtp_valid_pair = None
	_add_event("RTPTransportICENegotiationDidFail", dict(obj=rtp_transport, reason=_pj_status_to_str(status)))
	elif op == PJ_ICE_STRANS_OP_INIT:
	if status == 0:
	rtp_transport.state = "INIT"
	_add_event("RTPTransportDidInitialize", dict(obj=rtp_transport))
	else:
	rtp_transport.state = "INVALID"
	_add_event("RTPTransportDidFail", dict(obj=rtp_transport, reason=_pj_status_to_str(status)))
	else:
	pass
	except:
	ua._handle_exception(1)

	cdef void _RTPTransport_cb_ice_state(pjmedia_transport *tp, pj_ice_strans_state prev, pj_ice_strans_state curr) with gil:
	cdef void *rtp_transport_void = NULL
	cdef RTPTransport rtp_transport
	cdef PJSIPUA ua
	try:
	ua = _get_ua()
	except:
	return
	try:
	if tp != NULL:
	rtp_transport_void = (<void **> (tp.name + 1))[0]
	if rtp_transport_void != NULL:
	rtp_transport = (<object> rtp_transport_void)()
	if rtp_transport is None:
	return
	_add_event("RTPTransportICENegotiationStateDidChange", dict(obj=rtp_transport,
	prev_state=_ice_state_to_str(prev),
	state=_ice_state_to_str(curr)))
	except:
	ua._handle_exception(1)

	cdef void _RTPTransport_cb_ice_stop(pjmedia_transport tp, char reason, int err) with gil:
	cdef void *rtp_transport_void = NULL
	cdef RTPTransport rtp_transport
	cdef PJSIPUA ua
	try:
	ua = _get_ua()
	except:
	return
	try:
	if tp != NULL:
	rtp_transport_void = (<void **> (tp.name + 1))[0]
	if rtp_transport_void != NULL:
	rtp_transport = (<object> rtp_transport_void)()
	if rtp_transport is None:
	return
	rtp_transport._ice_active = 0
	rtp_transport._rtp_valid_pair = None
	_reason = reason
	if _reason != b"media stop requested":
	_add_event("RTPTransportICENegotiationDidFail", dict(obj=rtp_transport, reason=_reason))
	except:
	ua._handle_exception(1)

	cdef void _AudioTransport_cb_dtmf(pjmedia_stream stream, void user_data, int digit) with gil:
	cdef AudioTransport audio_stream = (<object> user_data)()
	cdef PJSIPUA ua
	try:
	ua = _get_ua()
	except:
	return
	if audio_stream is None:
	return
	try:
	_add_event("RTPAudioStreamGotDTMF", dict(obj=audio_stream, digit=chr(digit)))
	except:
	ua._handle_exception(1)

	# globals

	cdef pjmedia_ice_cb _ice_cb
	_ice_cb.on_ice_complete = _RTPTransport_cb_ice_complete
	_ice_cb.on_ice_state = _RTPTransport_cb_ice_state
	_ice_cb.on_ice_stop = _RTPTransport_cb_ice_stop

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