Our customer tries to establish a call from C20 to Sony endpoints as shown in attached file.
As far as I know, C20 can not change the port number used for dialing.(designating port 1721 instead of 1720)
Does anybody know if it is possible?
Sony endpoints can change their ports generally used for Q.931.
So just to clarify, if Sony Endpoint configured to listing incoming H225 signal from port 1721, C20 won’t able to negotiate the call (while both Endpoint are not registered on Gatekeeper).