Error Payload Type: Unknown

Unanswered Question
Oct 26th, 2009

I have a client with the following voip network:

- A remote site with connection to central site where there is a cluster of call manager, through a voice gateway (wan).

- A central site with a cluster of call manager and a voice gateway and PRIs to call PSTN.

When a call from remote site to a PBX through PSTN, the PBX is a call center where the secreatry transfer me to other people, for now it's all ok. The secretary call watting me, and she call to the person if he is busy or free to receive me call. After that the secretary try to recovery me call and then she and me lost the audio and I don't listen nothing.

I did a capture with wireshark in the gateway of central site and when this event occur, wireshark show me the following:

-"104892","907.627554","172.30.0.1","172.30.7.45","RTP","PT=ITU-T G.711 PCMU, SSRC=0x2BE0001, Seq=10741, Time=2868891212 "

-"104897","907.641790","172.30.0.1","172.30.7.45","RTP EVENT","Payload type=RTP Event, Cisco NSE: Shift to voiceband data mode"

-"104900","907.648924","172.30.0.1","172.30.7.45","RTP","PT=ITU-T G.711 PCMU, SSRC=0x2BE0001, Seq=10743, Time=2868891372 "

-"104900","907.648924","172.30.0.1","172.30.7.45","RTP","PT=ITU-T G.711 PCMU, SSRC=0x2BE0001, Seq=10743, Time=2868891372 "

-"104904","907.659478","172.30.0.1","172.30.7.45","RTP EVENT","Payload type=RTP Event, Cisco NSE: Shift to voiceband data mode"

-"104908","907.666562","172.30.0.1","172.30.7.45","RTP","PT=ITU-T G.711 PCMU, SSRC=0x2BE0001, Seq=10745, Time=2868891532 "

-"104912","907.677117","172.30.0.1","172.30.7.45","RTP EVENT","Payload type=RTP Event, Cisco NSE: Shift to voiceband data mode"

-"104919","907.698435","172.30.0.1","172.30.7.45","RTP","PT=Unknown (90), SSRC=0x2BE0001, Seq=10747, Time=2868891772 "

-"104926","907.719549","172.30.0.1","172.30.7.45","RTP","PT=Unknown (90), SSRC=0x2BE0001, Seq=10748, Time=2868891932 "

This it is the communication between the gateway of central site to IP Phone to remote site. In the other way, IP Phone to gateway of central site, the codec uses is always G.711.

The event ID when this occur is 192: Event ID: Cisco NSE: Shift to voiceband data mode (192)

Why occur this problem?Why change the Payload to unknown?

Thanks for all.

I have this problem too.
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