MTS problem with receiving early media

[manieq]

Hi all,

I’m stuck with an RTP related problem. Perhaps you could help me with this?

 UserA => SBC-A => AS => SBC-B => UserB

UserA and UserB are MTS scenarios. The case is about to respond by UserB with 180+SDP & sending early media. In standard configuration original RTP stream iis delivered do UserB (incl. original SSRC headers). MTS scenario for UserA receives such traffic (receiveMessageRTPFLOW OK - same SSRC as originating one).

Oracle SBC offers the possibility to send locally generated stream (local media playback from WAV file). So after 180 being sent to UserA SBC-A starts sending its own stream (ignoring any media coming from UserB). Such stream has of course completely different RTP headers (ssrc/seqnum/time). In such situation MTS is ignoring the stream (which still reaches correct IP/port) and receiveMessageRTPFLOW timed out.

Later on after 200/ACK both users send/receive media without any problems in all cases (forwarded or local stream on SBC-A).

Do you have any suggestion or hint where to check? Or something in protocol configuration should be modified (for udp/rtp/rtpflow)? It seems I cannot set route.MESSAGE_ID for RTPFLOW config since it is not what UserB emits – so what else?

BTW it there any other distribution list for MTS or this is the right/only place?

Regards,
Mariusz

[egwepas]

Hello,

Sorry, projet is not very active and I don't know when anyone will have time to answer you, but yes this is the only/right place.

Regards,