Internal DN set to CFA to user's Cell phone.
External caller hits that line, CFA passes on calling party CID.
Our carrier has a rule that denies calls coming from us unless they're in our DID block.
Old carrier, no problem, this carrier is SIP (though it's a PRI circuit to us, it's SIP carrier to carrier)
Same thing will happen if I setup a Caller ID Mask for any of my DNs -- the Carrier will deny the call because these digits are not in the range of DID's we have. Cause Code is 57 - Bearer capability not authorized)
Question is this -- I've read through RFC 3261 (SIP) and I can't find that this requirement exists -- to where we cannot 'spoof' our Calling Party ID, or forward on the original Calling Party ID off-net.
Does anyone have any insight on this?