We plan on migrating from Avaya CM to 3CX gradually and so need to connect the 3CX server to the Avaya via a SIP connection. All the Avaya work has been completed and I can consistently make calls to the 3CX, however the other way around I can only make successful calls occasionally to the Avaya...
I have a H175 avaya video collaboration Station phone, i want to connect with 3 CX PBX, H175 use SIP protocol for comunication, Could you help me please ? what i need to do for solve this problem ?