Message Flows
Page describes the flow of the messages for an incoming call. The flow of the messages is the same no matter the protocol used by the incoming call or on which protocol the call will go to.
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Incoming Call Setup
Flow of messages:
Routing
When a channel detects incoming call(1), it sends call.route(2) to decide where to route it to. The call.route message maps a called number to a call target.
Connecting
When the call target is known, incoming channel attaches its CallEndPoint to call.execute message(4). Recipient should connect its CallEndPoint to CallEndPoint attached to call.execute. While waiting for call acceptance recipient may send call.ringing(6). On call acceptance call.answered(7) is sent.
During the call
During the call chan.dtmf messages(8,9) may be sent in both directions.
Hangup
When incoming channel detects hangup(10) it disconnects its CallEndPoint. That results in chan.disconnected and eventually chan.hangup messages(not included in the diagram) sent by both channels.
See also
