CUCM is connected to Carrier SBC via CUBE and have a question regards the MTP requirement.
The only requirement for MTP is to provide 'intercept message' by carrier when dial out a long distance call without '1' in front of 10 digit by mistaken. when I enabled MTP in CUCM SIP trunk interface, IP Phone can get proper intercept message from carrier as exmaple 'please add 1 in front of your dial destination' but 'air dead' if I disable MTP.
As I know its 'early media' feature and I found CUBE support the following,
voice service voip
Is the carrier 'intercept message' accomplished by 'early media' feature in CUBE? My goal is eliminate MTP requirement in CUCM side.
Thanks in advance,