Call hangs after 1 second
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Happened on M2. Problem was with G729 codec.
Search for Freeswitch LegB log. It showed:
[ERR] switch_core_io.c:1445 Codec G.729 encoder error!
LegA log and pcap showed that BYE is sent from M2 after 0.000x seconds when call was ANSWERED.
Solution - use only G729 or only another codec to avoid transcoding.