Unknown payload type on OpenBSC when using rtp-bridge on LCR

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Nik Pakar nikpakar at gmail.com
Thu Mar 15 11:53:26 UTC 2012


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.

http://pastebin.com/rPfMamx0

Rgds
Nik
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