tree 5fb38addd1f28fdb1a7464660d773b63e04b0003
parent 11a746acd3de12e8b067283f977c6f7eaeb3ada1
author Neels Hofmeyr <nhofmeyr@sysmocom.de> 1642112282 +0100
committer Neels Hofmeyr <nhofmeyr@sysmocom.de> 1679105134 +0100

do CN CRCX first

In order to send the MSC's RTP endpoint IP address+port in the initial
SDP, move the MGCP CRCX up to an earlier point in the sequence of
establishing a voice call.

Update the voice call sequence chart to show the effects.

Though the semantic change is rather simple, the patch is rather huge --
things have to happen in a different order, and async waits have to
happen at different times.

The new codec filter helps to carry codec resolution information across
the newly arranged code paths.

Related: SYS#5066
Change-Id: Ie433db1ba0c46d4b97538a969233c155cefac21c