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SIP PSTN DTMF Issue

BadPacket
Beginner
Beginner

I am attempting to use a 2811 router as a SIP / PSTN gateway. SIP is from our PBX. PSTN is one of the big guys.

The 2811 connects to the PSTN with a VWIC-2MFT-T1.

Calls work great. However, no DTMF digits are transmitted to the PSTN. That is, you can call another party's system but you cannot use their IVR.

 

The router is receiving the digits from our SIP PBX. I can see the digits when debugging named events. Like so:

*Jul 8 01:30:11.474: s=VoIP d=DSP payload 0x65 ssrc 0xF30B7083 sequence 0x31B1 timestamp 0xB9A0
*Jul 8 01:30:11.474: <<<Rcv> Pt:101 Evt:4 Pkt:0D 01 40

 

IOS is 15.1(3)T4.

 

Outbound dial peer:

dial-peer voice 2002 pots
preference 10
destination-pattern .
port 0/1/0:23

Inbound dial peer:

dial-peer voice 2012 voip
preference 10
session protocol sipv2
incoming called-number .
dtmf-relay rtp-nte
dtmf-interworking rtp-nte
codec g711ulaw
no vad

 

I have bashed my brain on this for a week now and would appreciate any insight that you might have.

 

 

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