I connect to my Asterisk (A) using SIP. My Asterisk (A) is connected to another Asterisk (B) using IAX (as explained in voip-info.org/wiki-Asterisk±+dual+servers Example2). Asterisk B is connected to a SIP Provider (SparVoip, a BetaMax.com spin-off) that supports transmission of the CallerID to the called party (PSTN).
I place calls from my Softphone through A and B to SparVoip. If I set the CallerID in B’s extensions, it is displayed on the called device. But if I set the CallerID in A, it is not forwarded/taken over in B.
How can I read the CallerID from A in B? How can I take over this CallerID in B?