The Digital T1/E1 Packet Voice Trunk Network Module provides a flexible and scalable T1/E1 voice solution for Cisco 2600 and 3600 series multiservice modular access routers and supports up to 60 voice channels in a single network module. A single Packet Voice Trunk Network Module supports both on-premise and off-premise connections to both Private branch exchanges (PBXs) and public switched telephone networks (PSTNs). This product is for enterprise branches and large businesses wishing to migrate to packet-based multiservice infrastructures. It leverages investments in existing legacy telephony equipment and enables the deployment of new packet voice applications while reducing recurring telephony charges.

The Digital T1/E1 Packet Voice Trunk Network Module uses a real-time cpu and powerful digital signal processors (DSPs) which support all functions needed to provide the highest levels of voice fidelity and quality, eliminating the processing burden from the Cisco 2600 or 3600`s main CPU. These DSPs can be scaled to support from six to 60 voice channels in a single Network Module using a number of different voice compression algorithms. The packet voice trunk network module uses MultiFlex Voice/WAN interface cards (VWICs) which offer single and dual port T1 and E1 interfaces for additional versatility and scalability. This flexibility allows voice and fax traffic to travel cost-efficiently across a user`s wide area network (WAN) or directly over the PSTN.