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DTMF in 3way Conference Bridge

Hi all,

I am having a problem with DTMF in a Conference Bride.

This is the call flow.

 

PSTN FXO/PRI -> PSTN Router -> SIP Dialpeer -> CUCM -> SCCP Phone -> (Conference) -> (IVR) VXML Gateway.

 

The conference Bridge is the PSTN Router PVDM. this is the RTP audio flow.

 

PSTN CFB <-----> VXML (IOS) Gateway

 

When the 3 people (caller, called and IVR) are in conference, PSTN caller press digits but IVR does not recognize it, but we are able to hear the DTFM tones.

 

We use rtp-nte in out SIP Dial-peer --> CUCM.

 

How can the CFB Device send DTMF to VXML IOS GW? (its audio is point to point). is the CFB suposed to MIX the RTP NTE and send DTMF?

 

Juan.

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