Dtmf on sip phones 8831

[ukaszquz]

Hello,

I use CUCM v.10.5 and CUBE. CUCM and CUBE is connected by H323 gateway. On CUBE i have SIP trunk to PSTN provider. Now i use phones: 6921 (SCCP) and 8831 (SIP). I have problem with dtmf on SIP phones. If i have call from outside with dtmf option to SCCP phones all its working. If call from outside is to SIP phone (8831), dtmf doesnt work. I tested it with MTP and every time the same problem. Can you help me? 

On CUBE i have:

dial-peer voice 101 voip
 description **FROM**PSTN**
 session protocol sipv2
 session transport udp
 incoming called-number .
 voice-class codec 1  
 dtmf-relay rtp-nte
 no vad

dial-peer voice 121 voip
 description **TO-CUCM**
 preference 1
 destination-pattern 123456..
 session target ipv4:10.22.15.213
 voice-class codec 1  
 voice-class h323 1
 dtmf-relay rtp-nte h245-alphanumeric h245-signal
 no vad

On Cisco phone 8831 i have IOS: sip8831.10-3-1SR3-5-EU.

[Chris Deren]

Why would you have the GW connected to CUCM via H.323 when you have SIP trunk to ITSP on it?

Do yourself a favor and convert the H323 GW in CUCM to SIP trunk and issues like this will quickly go away.

If you decide against the advise you need to make sure you have proper inbound dial-peers not just outbound dial-peers matching proper DTMF method, i.e. add "incoming called-number ." or better yet specific expected called-number from CUCM towards the GW to the dial-peer 121.