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New Member

DTMF tones not recognized on SIP trunk PSTN calls

I have a SIP trunk to the PSTN when I make calls through my gateway over the SIP trunk to PSTN DTMF is not recognized. My VOIP dial peer looks like

dial-peer voice 5001 voip

description SIP DIAL-PEER TO TELCO

destination-pattern 9[2-9]..[0-9]...

progress_ind setup enable 3

progress_ind progress enable 8

session protocol sipv2

session target ipv4:69.51.100.172:30026

session transport udp

incoming called-number .

dtmf-relay rtp-nte digit-drop

codec g711ulaw

ip qos dscp ef signaling

no vad

My SIP trunk provider says they are not seeing the DTMF on there end.

3 REPLIES
New Member

Re: DTMF tones not recognized on SIP trunk PSTN calls

I changed the dtmf-relay to

dtmf-relay rtp-nte cisco-rtp

and it works

dial-peer voice 5001 voip

description SIP DIAL-PEER TO TELCO

destination-pattern 9[2-9]..[0-9]...

progress_ind setup enable 3

progress_ind progress enable 8

session protocol sipv2

session target ipv4:69.51.100.172:30026

session transport udp

incoming called-number .

dtmf-relay rtp-nte cisco-rtp

codec g711ulaw

ip qos dscp ef signaling

no vad

New Member

Re: DTMF tones not recognized on SIP trunk PSTN calls

Can you send your SIP configuration? I have it set up the same way, and I still do not get dtmf no do I hear the ringback.

Thanks

New Member

Re: DTMF tones not recognized on SIP trunk PSTN calls

FYI.. I upgraded my IOS from 12.4 (20)T to 12.4 (24)T and it fixed my dtmf issue. I still don't hear ringback, however.

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