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Problem with DTMF over SIP Trunk

Thiago Gandara
Level 1
Level 1

Hi voice team, a configured a SIP trunk on my router Cisco.

 

I´m using a CUCM 8.6 SCCP Phones -> H.323 -> Voice GW -> SIP Trunk -> Provider.

 

I configured the option " dtmf-relay rtp-nte" on dial-peer and works with majory number, but when i try to use DTMF with specific number, the number dont collect the digit.

 

I wonder why only a specific number does not accept dtmf?

 

Thanks,

4 RESPOSTAS 4

dsobrinho
Level 9
Level 9

Hi,


If is only one number that does not work dtmf, could not be problem of your config.


Try to re-check the trunk config in your equipment.

Or

 

GWY

 

dial-peer voice 1000 voip
 description ***OUTGOING CALLS TO ISP-PSTN***
 destination-pattern 7[123]..
 session protocol sipv2
 session target ipv4:10.113.0.2
 voice-class codec 1 
 dtmf-relay rtp-nte
 fax-relay ecm disable
 no fax-relay sg3-to-g3
 fax protocol pass-through g711ulaw
 no vad

 


Best regards,

Daniel Sobrinho

 

Daniel Sobrinho

HI,

The option "dtmf-relay rtp-nte" its appy on dial-peer.

Thanks,

Hi,

If the problem occurs only for a specific number that you call. The problem may be in the equipment where this number answers.

Best regards,

Daniel Sobrinho

Daniel Sobrinho

rafamar2
Level 1
Level 1

Hey

In this case the best thing to do:

 

1- on gateway collect the following, debug ccsip messages on the gateway which is sip trunking to ITSP. 

2- Place a test call to this specific number and try to send the DTMF

3- Collect the debug output

4- Take note of calling number / called number

With this you will be able to check which is the DTMF that is being negotiated on the far end, and if it's will be necessary to have a MTP to "translate" DTMF to this specific number.

Other question for you, are doing early offer or delay offer when calling to this number?

 

Thanks

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