dtmf over SIP Trunk to VOIP Provider

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Aug 8th, 2008
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Anyone experienced issues with dtmf over sip trunks to VOIP Provider, all works good internally but does not work outbound dtmf or inbound on the auto attendant, i have tried all the dtmf relays in the dial-peer ooptions and nothing

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mhering8650 Fri, 08/08/2008 - 08:50
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What kind of Gateway? H323 or MGCP?


You have to set the dial peer to relay DTMF, and add something like dtmf-relay rtp-nte (depending on which SIP provider you have)




For example here is one of my SIP dial-peers


dial-peer voice 100 voip

translation-profile incoming DID_Incoming

translation-profile outgoing no-nine

preference 1

service session

destination-pattern .T

rtp payload-type cisco-codec-fax-ack 114

rtp payload-type cisco-codec-fax-ind 113

rtp payload-type nte 98

voice-class sip dtmf-relay force rtp-nte

session protocol sipv2

session target sip-server

incoming called-number .

dtmf-relay rtp-nte

codec g711ulaw

fax rate disable

fax protocol pass-through g711ulaw

ip qos dscp cs5 media

ip qos dscp cs3 signaling

no vad

!

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