#include <localep.h>

Inheritance diagram for OpalLocalEndPoint:

Collaboration diagram for OpalLocalEndPoint:

Public Member Functions
Construction
	OpalLocalEndPoint (OpalManager &manager, const char *prefix=OPAL_LOCAL_PREFIX, bool useCallbacks=true)

	~OpalLocalEndPoint ()

Overrides from OpalEndPoint
virtual OpalMediaFormatList	GetMediaFormats () const

virtual PSafePtr< OpalConnection >	MakeConnection (OpalCall &call, const PString &party, void userData=NULL, unsigned int options=0, OpalConnection::StringOptions stringOptions=NULL)

Customisation call backs
PSafePtr< OpalLocalConnection >	GetLocalConnectionWithLock (const PString &token, PSafetyMode mode=PSafeReadWrite)

virtual OpalLocalConnection *	CreateConnection (OpalCall &call, void userData, unsigned options, OpalConnection::StringOptions stringOptions)

virtual bool	OnOutgoingSetUp (const OpalLocalConnection &connection)

virtual bool	OnOutgoingCall (const OpalLocalConnection &connection)

virtual bool	OnIncomingCall (OpalLocalConnection &connection)

virtual bool	AlertingIncomingCall (const PString &token, OpalConnection::StringOptions *options=NULL, bool withMedia=false)

virtual bool	AcceptIncomingCall (const PString &token, OpalConnection::StringOptions *options=NULL)

virtual bool	RejectIncomingCall (const PString &token, const OpalConnection::CallEndReason &reason=OpalConnection::EndedByAnswerDenied)

virtual bool	OnUserInput (const OpalLocalConnection &connection, const PString &indication)

Member access
Synchronicity	GetDefaultAudioSynchronicity () const

void	SetDefaultAudioSynchronicity (Synchronicity sync)

Synchronicity	GetDefaultVideoSourceSynchronicity () const

void	SetDefaultVideoSourceSynchronicity (Synchronicity sync)

bool	IsDeferredAlerting () const

void	SetDeferredAlerting (bool defer)

bool	IsDeferredAnswer () const

void	SetDeferredAnswer (bool defer)

bool	WillPauseTransmitMediaOnHold () const

void	SetPauseTransmitMediaOnHold (bool pause)

void	SetFarEndCameraCapabilityChangedNotifier (const PNotifier &notifier)
	Set a callback for when the far end camera control capabilities change. More...

const PNotifier &	GetFarEndCameraCapabilityChangedNotifier () const
	Get a callback for when the far end camera control capabilities change. More...

void	SetFarEndCameraActionNotifier (const PNotifier &notifier)
	Set a callback for when a far end camera control action comes from remote. More...

const PNotifier &	GetFarEndCameraActionNotifier () const
	Get a callback for when a far end camera control action comes from remote. More...

Public Member Functions inherited from OpalEndPoint
	P_DECLARE_BITWISE_ENUM (Attributes, 2,(NoAttributes, IsNetworkEndPoint, SupportsE164))

	OpalEndPoint (OpalManager &manager, const PCaselessString &prefix, Attributes attributes)

	~OpalEndPoint ()

virtual void	ShutDown ()

void	PrintOn (ostream &strm) const

bool	StartListeners (const PStringArray &interfaces, bool add=true)

virtual bool	StartListener (const PString &address)

virtual bool	StartListener (OpalListener *listener)

virtual PStringArray	GetDefaultListeners () const

virtual PString	GetDefaultTransport () const

virtual WORD	GetDefaultSignalPort () const

OpalListener *	FindListener (const OpalTransportAddress &iface)

bool	FindListenerForProtocol (const char *proto, OpalTransportAddress &addr)

PBoolean	StopListener (const OpalTransportAddress &iface)

PBoolean	RemoveListener (OpalListener *listener)

OpalTransportAddressArray	GetInterfaceAddresses (const OpalTransport *associatedTransport=NULL) const

	PDECLARE_AcceptHandlerNotifier (OpalEndPoint, NewIncomingConnection)

virtual void	OnNewConnection (OpalCall &call, OpalConnection &connection)

virtual PBoolean	OnSetUpConnection (OpalConnection &connection)

virtual PBoolean	OnIncomingConnection (OpalConnection &connection, unsigned options, OpalConnection::StringOptions *stringOptions)

virtual void	OnProceeding (OpalConnection &connection)

virtual void	OnAlerting (OpalConnection &connection, bool withMedia)

virtual void	OnAlerting (OpalConnection &connection)

virtual OpalConnection::AnswerCallResponse	OnAnswerCall (OpalConnection &connection, const PString &caller)

virtual void	OnConnected (OpalConnection &connection)

virtual void	OnEstablished (OpalConnection &connection)

virtual void	OnReleased (OpalConnection &connection)

virtual void	OnHold (OpalConnection &connection, bool fromRemote, bool onHold)

virtual void	OnHold (OpalConnection &connection)

virtual PBoolean	OnForwarded (OpalConnection &connection, const PString &remoteParty)

virtual bool	OnTransferNotify (OpalConnection &connection, const PStringToString &info, const OpalConnection *transferringConnection)

virtual PBoolean	ClearCall (const PString &token, OpalConnection::CallEndReason reason=OpalConnection::EndedByLocalUser, PSyncPoint *sync=NULL)

virtual PBoolean	ClearCallSynchronous (const PString &token, OpalConnection::CallEndReason reason=OpalConnection::EndedByLocalUser, PSyncPoint *sync=NULL)

virtual void	ClearAllCalls (OpalConnection::CallEndReason reason=OpalConnection::EndedByLocalUser, PBoolean wait=true)

PSafePtr< OpalConnection >	GetConnectionWithLock (const PString &token, PSafetyMode mode=PSafeReadWrite) const

template<class ConnClass >
PSafePtr< ConnClass >	GetConnectionWithLockAs (const PString &token, PSafetyMode mode=PSafeReadWrite) const

PStringList	GetAllConnections ()

PINDEX	GetConnectionCount () const

virtual PBoolean	HasConnection (const PString &token)

virtual void	DestroyConnection (OpalConnection *connection)

virtual void	AdjustMediaFormats (bool local, const OpalConnection &connection, OpalMediaFormatList &mediaFormats) const

virtual bool	GetMediaTransportAddresses (const OpalConnection &provider, const OpalConnection &consumer, unsigned sessionId, const OpalMediaType &mediaType, OpalTransportAddressArray &transports) const

virtual PBoolean	OnOpenMediaStream (OpalConnection &connection, OpalMediaStream &stream)

virtual void	OnClosedMediaStream (const OpalMediaStream &stream)

virtual void	OnFailedMediaStream (OpalConnection &connection, bool fromRemote, const PString &reason)

void	SetMediaCryptoSuites (const PStringArray &security)

PStringArray	GetMediaCryptoSuites () const

virtual PStringArray	GetAllMediaCryptoSuites () const

virtual void	OnUserInputString (OpalConnection &connection, const PString &value)

virtual void	OnUserInputTone (OpalConnection &connection, char tone, int duration)

virtual PString	ReadUserInput (OpalConnection &connection, const char *terminators="#\r\n", unsigned lastDigitTimeout=4, unsigned firstDigitTimeout=30)

virtual PBoolean	Message (const PString &to, const PString &body)

virtual PBoolean	Message (const PURL &to, const PString &type, const PString &body, PURL &from, PString &conversationId)

virtual PBoolean	Message (OpalIM &Message)

virtual void	OnMessageReceived (const OpalIM &message)

virtual void	OnMWIReceived (const PString &party, OpalManager::MessageWaitingType type, const PString &extraInfo)

virtual bool	GetConferenceStates (OpalConferenceStates &states, const PString &name=PString::Empty()) const

virtual void	OnConferenceStatusChanged (OpalEndPoint &endpoint, const PString &uri, OpalConferenceState::ChangeType change)

virtual PStringList	GetNetworkURIs (const PString &name) const

virtual PBoolean	GarbageCollection ()

OpalManager &	GetManager () const

const PString &	GetPrefixName () const

bool	HasAttribute (Attributes opt) const

const OpalProductInfo &	GetProductInfo () const

void	SetProductInfo (const OpalProductInfo &info)

const PString &	GetDefaultLocalPartyName () const

virtual void	SetDefaultLocalPartyName (const PString &name)

const PString &	GetDefaultDisplayName () const

void	SetDefaultDisplayName (const PString &name)

OpalBandwidth	GetInitialBandwidth (OpalBandwidth::Direction dir) const

bool	SetInitialBandwidth (OpalBandwidth::Direction dir, OpalBandwidth bandwidth)

const OpalListenerList &	GetListeners () const

const OpalConnection::StringOptions &	GetDefaultStringOptions () const

void	SetDefaultStringOptions (const OpalConnection::StringOptions &opts, bool overwrite=false)

void	SetDefaultStringOption (const PCaselessString &key, const PString &data)

void	RemoveDefaultStringOption (const PCaselessString &key)

virtual PStringList	GetAvailableStringOptions () const

OpalConnection::SendUserInputModes	GetSendUserInputMode () const

void	SetSendUserInputMode (OpalConnection::SendUserInputModes mode)

const PIPSocket::QoS &	GetSignalQoS () const

void	SetSignalQoS (const PIPSocket::QoS &qos)

const PIPSocket::QoS &	GetMediaQoS (const OpalMediaType &type) const

void	SetMediaQoS (const OpalMediaType &type, const PIPSocket::QoS &qos)

PINDEX	GetMaxSizeUDP () const

void	SetMaxSizeUDP (PINDEX size)

Protected Attributes
bool	m_deferredAlerting

bool	m_deferredAnswer

bool	m_pauseTransmitMediaOnHold

CallbackMap	m_useCallback

Synchronicity	m_defaultAudioSynchronicity

Synchronicity	m_defaultVideoSourceSynchronicity

PNotifier	m_farEndCameraCapabilityChangedNotifier

PNotifier	m_farEndCameraActionNotifier

Protected Attributes inherited from OpalEndPoint
OpalManager &	m_manager

PCaselessString	m_prefixName

Attributes	m_attributes

PINDEX	m_maxSizeUDP

OpalProductInfo	m_productInfo

PString	m_defaultLocalPartyName

PString	m_defaultDisplayName

PStringArray	m_mediaCryptoSuites

PIPSocket::QoS	m_signalQoS

OpalManager::MediaQoSMap	m_mediaQoS

OpalBandwidth	m_initialRxBandwidth

OpalBandwidth	m_initialTxBandwidth

OpalConnection::StringOptions	m_defaultStringOptions

OpalConnection::SendUserInputModes	m_defaultSendUserInputMode

OpalListenerList	m_listeners

OpalEndPoint::ConnectionDict	m_connectionsActive

Media call backs
enum	Synchronicity { e_Synchronous, e_Asynchronous, e_SimulateSynchronous }

typedef map< OpalMediaType, CallbackUsage >	CallbackMap
	Map for indicating if a media type is to use callback virtual functions. More...

	P_DECLARE_BITWISE_ENUM (CallbackUsage, 2,(NoCallbacks, UseSourceCallback, UseSinkCallback))
	Enumeration for usage of media callback direction in CallbackMap. More...

bool	UseCallback (const OpalMediaFormat &mediaFormat, bool isSource) const
	Indicate media type and direction is to use virtual callback functions. More...

bool	SetCallbackUsage (const OpalMediaType &mediaType, CallbackUsage usage)
	Set callback usage for media type. More...

virtual bool	OnReadMediaFrame (const OpalLocalConnection &connection, const OpalMediaStream &mediaStream, RTP_DataFrame &frame)

virtual bool	OnWriteMediaFrame (const OpalLocalConnection &connection, const OpalMediaStream &mediaStream, RTP_DataFrame &frame)

virtual bool	OnReadMediaData (OpalLocalConnection &connection, OpalMediaStream &mediaStream, void *data, PINDEX size, PINDEX &length)

virtual bool	OnWriteMediaData (const OpalLocalConnection &connection, const OpalMediaStream &mediaStream, const void *data, PINDEX length, PINDEX &written)

virtual bool	CreateVideoInputDevice (const OpalConnection &connection, const OpalMediaFormat &mediaFormat, PVideoInputDevice *&device, bool &autoDelete)

virtual bool	CreateVideoOutputDevice (const OpalConnection &connection, const OpalMediaFormat &mediaFormat, bool preview, PVideoOutputDevice *&device, bool &autoDelete)

virtual Synchronicity	GetSynchronicity (const OpalMediaFormat &mediaFormat, bool isSource) const

Additional Inherited Members
Protected Member Functions inherited from OpalEndPoint
OpalConnection *	AddConnection (OpalConnection *connection)

Detailed Description

Local EndPoint. This class represents an endpoint on the local machine that can receive media via virtual functions.

Member Typedef Documentation

typedef map<OpalMediaType, CallbackUsage> OpalLocalEndPoint::CallbackMap

Map for indicating if a media type is to use callback virtual functions.

Member Enumeration Documentation

enum OpalLocalEndPoint::Synchronicity

Indicate the synchronous mode for I/O. This indicates that the OnReadMediaXXX and OnWriteMediaXXX functions will execute blocking to the correct real time synchronisation. If GetSynchronicity() returns e_Synchronous, then, for example, when OnWriteMediaData() is sent 320 bytes of PCM data, it will block for 20 milliseconds.

If GetSynchronicity() returns e_SimulateSynchronous, then the system will try and simulate the correct timing using the operating system sleep function. This is not desirable as this function is notoriously inaccurate, and OPAL does it's best to compensate, but very often there is no other choice.

Note, it is important for the correct oeprating of the jitter buffer that one of the above two modes is used for audio.

If GetSynchronicity() returns e_Asynchronous, then the system will indicate that blocking is not required in any way. For example, when playing video, this is done as fast as data comes in from the network and there is no real time pacing required.

Enumerator
e_Synchronous	Functions will block for correct real time.
e_Asynchronous	Functions will not block, and do not require any real time handling.
e_SimulateSynchronous	Functions wlll not block, but do require real time handling.

Constructor & Destructor Documentation

OpalLocalEndPoint::OpalLocalEndPoint	(	OpalManager &	manager,
		const char *	prefix = `OPAL_LOCAL_PREFIX`,
		bool	useCallbacks = `true`
	)

Create a new endpoint.

Parameters

manager	Manager of all endpoints.
prefix	Prefix for URL style address strings
useCallbacks	Indicate all media is directed to the callback virtual functions

OpalLocalEndPoint::~OpalLocalEndPoint ( )

Destroy endpoint.

Member Function Documentation

virtual bool OpalLocalEndPoint::AcceptIncomingCall	(	const PString &	token,
		OpalConnection::StringOptions *	options = `NULL`
	)

virtual

Accept the incoming connection. Returns false if the connection token does not correspond to a valid connection.

Parameters

token	Token of connection to accept call
options	Optional string optiosn to apply

virtual bool OpalLocalEndPoint::AlertingIncomingCall	(	const PString &	token,
		OpalConnection::StringOptions *	options = `NULL`,
		bool	withMedia = `false`
	)

virtual

Indicate alerting for the incoming connection. Returns false if the connection token does not correspond to a valid connection.

Parameters

token	Token of connection to indicate alerting
options	Optional string optiosn to apply
withMedia	Indicate media should be started

virtual OpalLocalConnection* OpalLocalEndPoint::CreateConnection	(	OpalCall &	call,
		void *	userData,
		unsigned	options,
		OpalConnection::StringOptions *	stringOptions
	)

virtual

Create a connection for the PCSS endpoint. The default implementation is to create a OpalLocalConnection.

Parameters

call	Owner of connection
userData	Arbitrary data to pass to connection
options	Option bit mask to pass to connection
stringOptions	Options to pass to connection

Reimplemented in OpalSockEndPoint.

virtual bool OpalLocalEndPoint::CreateVideoInputDevice	(	const OpalConnection &	connection,
		const OpalMediaFormat &	mediaFormat,
		PVideoInputDevice *&	device,
		bool &	autoDelete
	)

virtual

Create an PVideoInputDevice for a source media stream.

Parameters

connection	Connection needing created video device
mediaFormat	Media format for stream
device	Created device
autoDelete	Flag for auto delete device

Reimplemented in OpalPCSSEndPoint.

virtual bool OpalLocalEndPoint::CreateVideoOutputDevice	(	const OpalConnection &	connection,
		const OpalMediaFormat &	mediaFormat,
		bool	preview,
		PVideoOutputDevice *&	device,
		bool &	autoDelete
	)

virtual

Create an PVideoOutputDevice for a sink media stream or the preview display for a source media stream.

Parameters

connection	Connection needing created video device
mediaFormat	Media format for stream
preview	Flag indicating is a preview output
device	Created device
autoDelete	Flag for auto delete device

Synchronicity OpalLocalEndPoint::GetDefaultAudioSynchronicity ( ) const

inline

Get default synchronous mode for audio sources and sinks.

References m_defaultAudioSynchronicity.

Synchronicity OpalLocalEndPoint::GetDefaultVideoSourceSynchronicity ( ) const

inline

Get default synchronous mode for video sources.

References m_defaultVideoSourceSynchronicity.

const PNotifier& OpalLocalEndPoint::GetFarEndCameraActionNotifier ( ) const

inline

Get a callback for when a far end camera control action comes from remote.

References m_farEndCameraActionNotifier.

const PNotifier& OpalLocalEndPoint::GetFarEndCameraCapabilityChangedNotifier ( ) const

inline

Get a callback for when the far end camera control capabilities change.

References m_farEndCameraCapabilityChangedNotifier.

PSafePtr<OpalLocalConnection> OpalLocalEndPoint::GetLocalConnectionWithLock	(	const PString &	token,
		PSafetyMode	mode = `PSafeReadWrite`
	)

inline

Find a connection that uses the specified token. This searches the endpoint for the connection that contains the token as provided by functions such as MakeConnection(). If not then it attempts to use the token as a OpalCall token and find a connection of the same class.

Parameters

token	Token to identify connection
mode	Lock mode

virtual OpalMediaFormatList OpalLocalEndPoint::GetMediaFormats ( ) const

virtual

Get the data formats this endpoint is capable of operating. This provides a list of media data format names that may be used by an OpalMediaStream may be created by a connection from this endpoint.

Note that a specific connection may not actually support all of the media formats returned here, but should return no more.

The default behaviour returns the most basic media formats, PCM audio and YUV420P video.

Implements OpalEndPoint.

Reimplemented in OpalMixerEndPoint, and OpalIVREndPoint.

virtual Synchronicity OpalLocalEndPoint::GetSynchronicity	(	const OpalMediaFormat &	mediaFormat,
		bool	isSource
	)		const

virtual

Indicate the I/O synchronous mode. See Synchronicity for more details.

Default behaviour returns m_defaultAudioSynchronicity (initially e_Synchronous) when is audio source or sink, m_defaultVideoSourceSynchronicity (initially e_Synchronous) when a video source, e_Asynchronous in all other cases.

Parameters

mediaFormat	Media format for stream being opened.
isSource	Stream is a a source

bool OpalLocalEndPoint::IsDeferredAlerting ( ) const

inline

Indicate OnAlerting() is be deferred or immediate.

References m_deferredAlerting.

bool OpalLocalEndPoint::IsDeferredAnswer ( ) const

inline

Indicate AcceptIncomingCall() execution is be deferred or immediate on OnIncomingCall().

References m_deferredAnswer.

virtual PSafePtr<OpalConnection> OpalLocalEndPoint::MakeConnection	(	OpalCall &	call,
		const PString &	party,
		void *	userData = `NULL`,
		unsigned int	options = `0`,
		OpalConnection::StringOptions *	stringOptions = `NULL`
	)

virtual

Set up a connection to a remote party. This is called from the OpalManager::MakeConnection() function once it has determined that this is the endpoint for the protocol.

The general form for this party parameter is:

 [proto:][alias@][transport$]address[:port]

where the various fields will have meanings specific to the endpoint type. For example, with H.323 it could be "h323:Fred@site.com" which indicates a user Fred at gatekeeper size.com. Whereas for the PSTN endpoint it could be "pstn:5551234" which is to call 5551234 on the first available PSTN line.

The proto field is optional when passed to a specific endpoint. If it is present, however, it must agree with the endpoints protocol name or false is returned.

This function usually returns almost immediately with the connection continuing to occur in a new background thread.

If false is returned then the connection could not be established. For example if a PSTN endpoint is used and the assiciated line is engaged then it may return immediately. Returning a non-NULL value does not mean that the connection will succeed, only that an attempt is being made.

The default behaviour is pure.

Parameters

call	Owner of connection
party	Remote party to call
userData	Arbitrary data to pass to connection
options	options to pass to conneciton
stringOptions	Options to pass to connection

Implements OpalEndPoint.

Reimplemented in OpalSockEndPoint, and OpalIVREndPoint.

virtual bool OpalLocalEndPoint::OnIncomingCall ( OpalLocalConnection & connection )

virtual

Call back to indicate that there is an incoming call. Note this function should not block or it will impede the operation of the stack.

The default implementation returns true;

Returns: false is returned the call is aborted with status of EndedByLocalBusy.

Parameters

connection Connection having event

Reimplemented in OpalConsolePCSSEndPoint, and OpalPCSSEndPoint.

virtual bool OpalLocalEndPoint::OnOutgoingCall ( const OpalLocalConnection & connection )

virtual

Call back to indicate that remote is ringing. If false is returned the call is aborted.

The default implementation does nothing.

Parameters

connection Connection having event

Reimplemented in OpalPCSSEndPoint.

virtual bool OpalLocalEndPoint::OnOutgoingSetUp ( const OpalLocalConnection & connection )

virtual

Call back just before remote is contacted. If false is returned the call is aborted with EndedByNoAccept.

The default implementation returns true.

Parameters

connection Connection having event

virtual bool OpalLocalEndPoint::OnReadMediaData	(	OpalLocalConnection &	connection,
		OpalMediaStream &	mediaStream,
		void *	data,
		PINDEX	size,
		PINDEX &	length
	)

virtual

Call back to get media data for transmission. If false is returned the media stream will be closed.

Care with the handling of real time is required, see GetSynchronicity for more details.

The default implementation fills the buffer with zeros and returns true.

Parameters

connection	Connection for media
mediaStream	Media stream data is required for
data	Data to send
size	Maximum size of data buffer
length	Number of bytes placed in buffer

virtual bool OpalLocalEndPoint::OnReadMediaFrame	(	const OpalLocalConnection &	connection,
		const OpalMediaStream &	mediaStream,
		RTP_DataFrame &	frame
	)

virtual

Call back to get media data for transmission. If false is returned then OnReadMediaData() is called.

Care with the handling of real time is required, see GetSynchronicity for more details.

The default implementation returns false.

Parameters

connection	Connection for media
mediaStream	Media stream data is required for
frame	RTP frame for data

virtual bool OpalLocalEndPoint::OnUserInput	(	const OpalLocalConnection &	connection,
		const PString &	indication
	)

virtual

Call back to indicate that the remote user has indicated something. If false is returned the call is aborted.

The default implementation does nothing.

Parameters

connection	Connection having event
indication	User input received

Reimplemented in OpalPCSSEndPoint.

virtual bool OpalLocalEndPoint::OnWriteMediaData	(	const OpalLocalConnection &	connection,
		const OpalMediaStream &	mediaStream,
		const void *	data,
		PINDEX	length,
		PINDEX &	written
	)

virtual

Call back to handle received media data. If false is returned the media stream will be closed.

It is expected that this function be real time. That is if 320 bytes of PCM-16 are written, this function should take 20ms to execute. If not then the jitter buffer will not operate correctly and audio will not be of high quality. This timing can be simulated if required, see GetSynchronicity for more details.

Note: For encoded audio media, if data is NULL then that indicates there is no incoming audio available from the jitter buffer. The application should output silence for a time. The written value should still contain the bytes of silence emitted, even though it will be larger that length. This does not occcur for raw (PCM-16) audio.

The default implementation ignores the media data and returns true.

Parameters

connection	Connection for media
mediaStream	Media stream data is required for
data	Data received
length	Amount of data available to write
written	Amount of data written

virtual bool OpalLocalEndPoint::OnWriteMediaFrame	(	const OpalLocalConnection &	connection,
		const OpalMediaStream &	mediaStream,
		RTP_DataFrame &	frame
	)

virtual

Call back to handle received media data. If false is returned then OnWriteMediaData() is called.

Care with the handling of real time is required, see GetSynchronicity for more details.

Note it is the responsibility of this function to update the frame timestamp for correct operation of the jitter buffer.

The default implementation returns false.

Parameters

connection	Connection for media
mediaStream	Media stream data is required for
frame	RTP frame for data

OpalLocalEndPoint::P_DECLARE_BITWISE_ENUM	(	CallbackUsage	,
		2	,
		(NoCallbacks, UseSourceCallback, UseSinkCallback)
	)

Enumeration for usage of media callback direction in CallbackMap.

virtual bool OpalLocalEndPoint::RejectIncomingCall	(	const PString &	token,
		const OpalConnection::CallEndReason &	reason = `OpalConnection::EndedByAnswerDenied`
	)