Patent ID: 6061363
Filing Date: 2000-05-09
Classification: H04L,H04Q

Abstract:
A method of establishing a narrow band communication channel across a broad band network, from a first terminal associated with a first narrow band network node to a second terminal associated with a second narrow band network node, the broad band network having a signalling protocol dissimilar to that or those provided in the respective narrow band nodes, each said node incorporating a call server having a plurality of substantially identical connection brokers coupled thereto, the method comprising:at the first narrow band node and on a first communication circuit, receiving an incoming call request from the first terminal, the incoming call request containing an address of the first terminal and a destination address associated with the second terminal;selecting via a said connection broker at the first node a phantom trunk different from the first communication circuit, the phantom trunk having a circuit identity and being arranged to support a narrow band communication between the first and second nodes;in a first message, sending the destination address and the circuit identity of the phantom trunk from the first node to the second node;in a second message, sending the circuit identity and the address of the first terminal to the second node;identifying via a said connection broker at the second node the presence of the circuit identity in both the first and the second message whereby to establish that the requested communication connection is between the first and second terminals; andestablishing the communication connection between the first and second terminals through the broad band network.