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neels uploaded patch set #5 to this change.

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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
---
M doc/sequence_charts/voice_call_external_mncc.msc
M doc/sequence_charts/voice_call_internal_mncc.msc
M include/osmocom/msc/gsm_04_08.h
M include/osmocom/msc/msc_a.h
M src/libmsc/gsm_04_08_cc.c
M src/libmsc/msc_a.c
M tests/msc_vlr/msc_vlr_test_call.c
M tests/msc_vlr/msc_vlr_test_call.err
8 files changed, 487 insertions(+), 261 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-msc refs/changes/40/31740/5

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