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A change in ICE credentials in the SDP detects an ICE restart and triggers stream reconstruction.

Clear pending tcp/tls address of record in case of network change. Very useful for legacy SIP server with  no sip instance support and limited number of air.

logging: use sal_set_log_level instead of sal_enable_logs and sal_disable_logs so that we have a finer control of logs verbosity

param: [sip,cnx_ip_to_0000_if_sendonly_enabled]  with default value 0

There is now an "SDP handling mode": you can choose between normal, simulate removal of SDP or simulate SDP error.
This allows for simulating 200 OK without SDP, for instance (a unit test is coming for this).

- take a background task during the ice gatethering for incoming call
- add timestamps to gtk debug window, which was required to investigate the issue.

Requires up to date belle-sip

For unicast calls, continue to bind to 0.0.0.0 as we need it for multi-homed environments.

change the way payload type numbers are assigned, so that an application can support more payload type than the RTP profile table allows to contain.
Compliance with RFC3264 (offer answer model) is improved, by reusing numbers in case of reINVITEs.
Fix memory leaks
Move offer/answer related tests into a new test suite.

tester automatically creates unique accounts on flexisip server before running tests. This allows several developer to run the test suite simultaneously !

fix the tunnel tests, that were not working correctly.

Do not crash if SDP could not be parsed and had some unit tests. - avoid crash if missing SDP in REINVITE ACK - resume previous media parametrs instead of aborting call in case of invalid SDP in REINVITE

refine conditions for refusing an UPDATE

For tests, the possibility to send an UPDATE with linphone_core_update_call() has been added thanks to a $
Added possibility to configure Supported SIP header.