I have implemented VOIP and CUCM for enterprise solution.
My setup is like this:-
What is the possibility of FAX T38 not going through even the call signaling & setup have been established and fax tone heard, but there are no response from remote fax.
Is it related to CCM5.0 MTP? As I have this "MTP" check at the SIP trunk to the SSW for sending SIP early-offer.