How to connect SIP Trunk to old PBX with E1 Port
How to connect SIP Trunk to old PBX with E1 Port or PRI Port. Thease days Telecom compinies are offering SIP Trunk to the consumers .Now users are having issues with there old model PBX which is having only E1 port and does not support SIP trunk . or if SIP trunk is supported then … Read more