DTMF issue over SIP Trunk to OCS

Unanswered Question
Oct 29th, 2009
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Hello,

we have the following scenario with OCS integration:


MGCP GW --> CUCM 6.1 --> Mediation GW --> OCS Conference IVR


When i call from the PSTN to the OCS Conference IVR, it should be possible to send DTMF and interrupt the women speaking. But when i press some digits on my phone, the women is still talking.


I tried some settings in the SIP Trunk from Callmanager to Mediation GW and on the MGCP Gateway that can change DTMF.

I did with no sucess. I also checked the Media Termination Point Required in the Trunk.


I have no idea what to do next and why it is not working with the DTMF.


When i call from the PSTN on a Cisco IP Phone that is on the Callmanager, DTMF works well. I hear the DTMF tones.


I hope someone can help me with this issue.

I also have a trace file with a non working call to the IVR and pressing some DTMF. I upload this when needed.


Thanks a lot for help...

Christian

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