As per "Implementing End-to-End SIP Vol 2" the answer seems to be C.
"CM-ES adds atrp=shortcut to the Accept-Contact header in the origdone SIP message. When CM-ES receives the imsterm phase tag with atrp=shortcut, it acts as a proxy and directly sends the message back to SM in the termdone leg without any further call processing or use of any additional trunk resources."
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KUCS
3 months, 1 week ago