I would like to configure my asterisk (B) to do this scenario:
1/ a client connects to a SIP server (A) (not my asterisk)
2/ this client receives a REFER to my asterisk server (B)
3/ my asterisk server (B) forward the client to an external asterisk ( C ) with the RE-INVITE method (mandatory)
Is this possible? If so, do you have an example of a configuration?
(I know this may sound weird but I have a very complicated architecture system)