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dtmf over SIP Trunk to VOIP Provider

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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New Member

Re: dtmf over SIP Trunk to VOIP Provider

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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