I have two sites with CUCME 7.0 routers. Site A has a PRI for outbound calls and a T1 connection to Site B. Site B forwards its outbound calls to Site A to go out the PRI.
When Site B makes an outbound call the call connects, but after that it doesn't forward any DTMF tones. You can hear the tones on the handset but it doesn't forward the tones outbound.
Site A does not have this problem.
I've tried a number of different dtmf-relay configs but nothing seems to help.
Here's the current dial peer config:
dial-peer voice 152 voip
description <<11 Digit Long Distance Numbers>>
session protocol sipv2
session target ipv4:192.168.150.1
You switch to H323 trunk simply by removing the "session protocol sipv2" statement from your dial peer pointing to the other CME.
Hope that helped, if so please rate.
To add something to Nick's good advice.
You might not know that the "preferred" protocol for trunking CMEs is H.323. When you switch to it, certain things magically start working. Not to say that this is necessarily the case here.