In order to send the MSC's RTP endpoint IP address+port in the inital
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.
Related: SYS#5066
Change-Id: Ie433db1ba0c46d4b97538a969233c155cefac21c
Add voice_call_full.msc, generated from a real 2G<->3G voice call log fed to
msc_log_to_ladder.py.
The idea is to document how the voice call sequence of events changes in
upcoming patches.
Change-Id: I8a907d6a4ece1f3ad78da75a8c3e3e76afd5418d