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CM 5.0(4) - 7912 & DTMF over SIP Trunk

Hi,

I have just installed CM5, and have 3

(IPC, 7940 and 7912) phones auto registered to it.

I have a SIP trunk, that connects to a third party SIP application.

When I make a call over the trunk,

the calls go through fine.

However, only on the 7912, the application on the other end is unable to pick up DTMF tones sent by the 7912.

7940 / CIPC work fine !!.

All phones use SCCP default firmware as shipped with CM5.

Any tips on where to start looking ????

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