DTMF issue between CUCM and UCCX

[S N]

Experts,

We have an issue with DTMF.

Scenario:

Call is passing from 3rd party SIP server to CUCM via SIP trunk and connected to UCCX and when the customer press any options in the prompt  the DTMF is not getting captured. We have checked this by debugging the CRS script.

But when I checked the check the SIP logs in CUCM I can see the INFO message with the DTMF.

Can anyone help me to understand is there any particular DTMF type that UCCX accepts and is the DTMF can be checked in MIVR logs and hot DTMF is passed from CUCM to UCCX.

Thanks

Sathya

[Deepak Mehta]

CTI ports for uccx supports only OOB dtmf method therefore in your case SIP provider might be sending only RTP NTE ( RFC 2833).

Either you can insert MTP on SIP trunk so that cucm can extract the dtmf.

You can also try changing the dtmf pref to OOB and RFC 2833.

Or try enabling both dtmf method on dial-peer pointing to cucm. 

[S N]

Yes , tried all the DTMF options in the CUCM CIP trunk.

is there a way to confirm if the DTMF is sent to UCCX.

Thanks

Sathya

[Deepak Mehta]

You can either check this in session trace on RTMT ( Via SIP ladder diagram) to see what is being offered and negotiated etc

Also you can download the call manager traces and try to trace the SIP call.

[S N]

Thanks Deepak,

yes through Session ladder I can see INFO message with proper DTMF options.

How this can be verify in UCCX whether the DTMF is passed from CUCM to UCCX.

Thanks

Sathya