asterisk users - Oct 2006 - sip trunk - SIP/2.0 488 Not Acceptable Media

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Hi folks,

I'm working on sip trunk between cme 4.x and asterisk (trixbox 1.2.3).
Well, the trunk is partially working, asterisk' extensions talk with 
cme, but
- - when cme try to connect to asterisk' number, receives "the number 
dialed is not in service".
- - calls from ISP through asterisk to cme don't work completely, and my 
sip debug says:
SIP/2.0 488 Not Acceptable Media
even if calls from ISP to asterisk use the same codec as asterisk with 
cme uses (g711alaw).

Any advice to point my troubleshooting in the right direction will be 
appreciated
Best Regards
Andrea
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