Hi Andreas,
After some extensive testing i have done using jolly/rtpmux branch to get rtp to go directly between bsc and softswitch (yate in this case) i came across following scenario.
MO call goes to OpenBSC/LCR then to yate routed back to OpenBSC/LCR and MT.
Signalling seems all fine including codec negotiating as through out the path AMR/96 is been negotiated well. But once call connected, no rtp stream exist and i see following error on OpenBSC.
received RTP frame with unknown payload type 98
Full topology and logs/trace from openbsc, LCR and yate is on this attachment.
What could be the reason for bsc to get payload type 98.
Rgds