[Bug 35598] Implement Call channels

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=35598

--- Comment #11 from Olivier Crête <olivier.crete at ocrete.ca> 2012-03-14 06:49:33 PDT ---
When you try to unhold, you call RequestHold(), then the CM tells the other
side that we're going to unhold and in parallel tp-glib emits
SendingStateChanged and ReceivingStateChange and waits for those to be
Completed. Then tp-glib emits HoldStateChanged.

If the Sending or Receiving state can't be completed to STARTED, then
ReportSending/ReceivingFailure are called. But we don't want those to change
the direction of the stream or end the call (which is what you'd normally do).
Instead, you just want to abort the Unhold and change the hold reason to
Resource_Not_Available. The reason for the  Report*Failure call is useless and
is always the same (TP_CALL_STATE_CHANGE_REASON_INTERNAL_ERROR,
TP_ERROR_STR_MEDIA_STREAMING_ERROR) because nothing else makes sense.

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