We announced a new communications product, Hangouts, in May 2013. Hangouts will replace Google Talk and does not support XMPP.

Call Class

A wrapper object in the voice chat example that bundles groups of Session objects into a single chat connection. It provides wrapper methods to handle adding or removing sessions, muting, and monitoring. It also manages creating a new VoiceChannel object (which wraps a P2PTransportChannel object and a MediaChannel) and associating that with each session. This object is created by PhoneSessionClient. To destroy it, call PhoneSessionClient::DestroyCall (the Call object calls this automatically when a Session is removed and the Session count reaches zero). The methods shown are not thread-safe, and can be called on any thread.


class Call : public MessageHandler, 
             public sigslot::has_slots<>


The following public methods are exposed by Call.

Name Description
void AcceptSession(Session *session) Accepts an incoming connection request. session is the Session sent out previously by SignalSessionState.
Call(PhoneSessionClient *session_client) Constructor. Creates a random ID to identify this object.
~Call Destructor. This method destroys all the Session objects that it holds a pointer to.
uint32 id() Returns a random ID assigned to the object (this is not the JID).
Session* InitiateSession(const buzz::Jid &jid, vector<XmlElement*> *extra_xml) Called by CallClient::MakeCallTo to explicitly make a call to someone. It sends a connection request and a PhoneSessionDescription (a list of codecs) to the other party, and starts generating local candidates. extra_xml is just an extra blob of arbitrary XML to send along with the stanza sent to the other computer (note that this is not used for session description or session info stanzas; this parameter is not used in any of the example code).
void Mute(bool mute) Mutes the sound in all the Session objects.
bool muted() Whether or not the sound is muted in the Session objects.
void OnAudioMonitor(VoiceChannel *channel, const AudioInfo &info) Called by the the Session VoiceChannel objects periodically with audio monitoring data. Sends SignalAudioMonitor. This is not called unless StartAudioMonitor is called.
void OnMessage(Message *message) Called with commands from other threads to enable multithreading. The only message handled is to call SessionClient::DestroyCall when the object no longer contains any Session objects.
void RedirectSession(Session *session, const buzz::Jid &to) Sends a redirect reply to a session connection request. This is a Session sent out previously by SignalSessionState.
void RejectSession(Session *session) Rejects a session connection request for the session sent out previously by SignalSessionState.
std::vector<Session *> & sessions() Returns the list of Session objects managed by this call.
void StartAudioMonitor(Session *session, int cms) Causes SignalAudioMonitor signals to be sent. This is not called in libjingle as shipped.
void StartConnectionMonitor(Session *session, int cms) Causes SignalConnectionMonitor signals to be sent. This is not called in libjingle as shipped.
void StopAudioMonitor(Session *session) Ends the sending of SignalAudioMonitor signals.
void StopConnectionMonitor(Session *session) Ends the sending of SignalConnectionMonitor signals.
void Terminate() Destroys all the sessions by calling TerminateSession on each Session.
void TerminateSession(Session *session) Calls Session::Terminate on each Session, which releases its resources.


SignalAddSession< Call *, Session * >
Called when AddSession is called and a session is added. No objects currently subscribe to this signal.
SignalRemoveSession< Call *, Session * >
Called when RemoveSession is called and a session is removed. No objects currently subscribe to this signal.
SignalSessionState< Call *, Session *, Session::State >
Called when a Session sends state information. It is very important to subscribe to this signal because it alerts the application when call connection requests are received, when calls are terminated, or other important events. Subscribe to this signal as soon as PhoneSessionClient sends SignalCallCreate.
SignalSessionError< Call *, Session *, Session::Error >
Called when a Session object sends an error message.
SignalConnectionMonitor< Call *, Session *, const std::vector< ConnectionInfo > & >
Sends periodic connection monitoring information. This signal won't be sent unless you call StartConnectionMonitor.
SignalAudioMonitor< Call *, Session *, const AudioInfo & >
Sends periodic audio monitoring information. This signal won't be sent unless you call StartAudioMonitor.


  • PhoneSessionClient


Attributes: public

Declaration file: talk/session/phone/call.h