Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

DTMF issue on SIP trunk

                   Hi there ,

                                I am facing issue on outbound calls where ever i make call to any Main number but it is not accepting extension numbers. i think is a DTMF

issue but which command i will use under dial-peer voice dial -peer.

CUCM --- VG --SIP---Service provider

dial-peer voice 20 voip

  translation-profile outgoing OUT-SIP

destination-pattern .T

voice-class codec 1

session protocol sipv2

session target ipv4:

session transport udp

dtmf-relay rtp-nte

no vad

Any help will be highly appreciated



Everyone's tags (4)

DTMF issue on SIP trunk

Don't be afraid to actually setup several different DTMF-relays under one statement, to get the DTMF Tones working on the SIP trunk to my provider, here's an example of my outbound dial-peer.

dial-peer voice 100 voip

description Outbound Voice SIP Calls

destination-pattern .T

session protocol sipv2

session target sip-server

voice-class codec 1 

voice-class sip early-offer forced

voice-class sip profiles 100

dtmf-relay rtp-nte cisco-rtp sip-kpml sip-notify

no vad

HTH,  Tony

Please rate this if it helps.

New Member

DTMF issue on SIP trunk

I tried but same ay help will be higly appreciated.

Re: DTMF issue on SIP trunk

Verify with the SIP ITSP what type of DTMF they support:

  • Notify <---> Notify since 12.4(4)T

  • RFC2833 <---> Notify since 12.4(4)T

  • Notify <---> RFC2833 since 12.4(4)T

  • Inband G711 <---> since 12.4(11)T [Requires Transcoder]

Take a look on this doc:


Leonardo Santana

New Member

Re: DTMF issue on SIP trunk

I have similar problem

We have SIP trunk with CME 8.6 and 10 SCCP (7960,7975) phones, also UM with Exchange 2010 , everything work perfectly until we added two SIP client phones.

SIP client phones 9971 and 7906 have issue with sending DTMF signals.

From both SIP phones I can call and receive calls but when I call some number with auto attended or voice mail on internal or external number I have problem to choose options ,

I hear DTMF tones but destination party does not.

I can leave message, which means that I have two way communication.

I notice this trying to access ours voice mailbox on Exchange 2010 I can make call but no DTMF command are recognized I cannot enter PIN for mailbox I hear DTMF tones but UM does not

everything is normal with SCCP clients phones , problem localized on SIP clients phones.

My configurations for SIP and those two phones are

voice service voip


no cti shutdown


allow-connections h323 to h323

allow-connections h323 to sip

allow-connections sip to h323

allow-connections sip to sip

supplementary-service h450.12

fax protocol t38 version 0 ls-redundancy 0 hs-redundancy 0 fallback none


call start slow

modem passthrough nse codec g711alaw



registrar server expires max 1200 min 60

early-offer forced

midcall-signaling passthru

voice register dn 1

number 101

call-forward b2bua noan 555 timeout 20

allow watch

name BOSS1


label 101 BOSS1

voice register dn 10

number 110

allow watch

name SHOP


label 110 SHOP

voice register pool 1

id mac 04C5.A4B0.3B0D

type 9971

number 1 dn 1

dtmf-relay sip-notify

username xxxx password zzzz

codec g711alaw



voice register pool 10

id mac 001E.7A25.EEA4

type 7906

number 1 dn 10

dtmf-relay sip-notify

username xxxx password zzzzz

codec g711alaw

Configuration of voicemail dial-peer

dial-peer voice 555 voip

description ** Exchange Unified Messaging **

destination-pattern 555

session protocol sipv2

session target ipv4:

session transport tcp

dtmf-relay rtp-nte

codec g711alaw

fax rate disable

fax protocol pass-through g711alaw

no vad

Any idea what is wrong or do you how can I troubleshot the problem

CreatePlease login to create content