[cisco-voip] SCCP ip phones and in-band DTMF problem

[Robert Hass]

Hi
I've got below infrastructure:
- 50 SCCP IP Phones (mailny 7941 and 7961)
- 2 analog faxes
- CUCME running IOS 15.0M at Cisco 3825 with PVDM2-64
- two trunks to PSTN : first via E1/PRI and second via H.323

I have problem with DTMF (it's not working at all) when traffic to PSTN is
pushed via H.323 peer. I contacted with telco provider and they supports
only in-band DTMF. I tested if it's working and I DTMF is indeed working when
tested in from analog line. It's look like in-band DTMF is not supported
when calls are done from SCCP phones.

Do exist and solution to my problem ? Maybe I should change software on
phones from SCCP to SIP or reconfigure something inside PSTN H.323 dial-peer ?

Dial-Peer configuration:

dial-peer voice 4000 voip
 translation-profile outgoing 1
 destination-pattern 0T
 session target ipv4:x.x.x.x
 codec g711alaw
 clid strip name
 no vad
!

Thanks,
Robert