The Digital T1 Packet Voice Trunk Network Module provides a flexible and scalable T1 voice solution for Cisco 2600, 3600, and 3700 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). These products are ideal for enterprise branches, large businesses and service providers wishing to migrate to packet-based multiservice infrastructures. This network module leverages existing legacy telephony equipment investments in addition to providing the ideal gateway interface for IP telephony within the Cisco Architecture for Voice, Video and Integrated Data (AVVID). It also enables the deployment of new packet voice applications while reducing recurring telephony charges.The Digital T1 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 2600/3600/3700'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 modules include a MultiFlex Voice/WAN interface card (VWIC) allowing voice and fax traffic to travel cost-efficiently across a user's wide area network (WAN) or directly over the PSTN.The Digital T1 Packet Voice Trunk network module combined with the Cisco 2600/3600/3700 series multiservice access routers makes an ideal single-box solution for packetized voice in branches and regional offices. Up to six packet voice trunk network modules can be configured in a single modular access router, supporting from 6 to 300 voice channels. Now, enterprise offices of several hundred users can deploy multiservice networking using a single box solution. Service providers, providing data and telephony managed services can connect a single platform to their central offices or points of presence (POPs) with a single high-speed data connection. The packet voice trunk network modules seamlessly interoperate with smaller and larger multiservice platforms from Cisco.The Digital T1 Packet Voice Trunk Network Module provides an ideal migration path to a multiservice network. Customers can gradually shift voice traffic from traditional circuit-switched networks to a single infrastructure carrying data, voice and video over packet networks without replacing any legacy PBX and key communication system equipment. This network module also provides the perfect solution for PBX and PSTN access to IP telephony in the Cisco AVVID architecture.With connectivity support for over 90% of the world's medium and large traditional circuit-switched PBXs and PSTNs, the Digital T1 Packet Voice Trunk Network Module provides every Enterprise the ability to integrate voice and data into a single multiservice infrastructure. As a result Multinational Enterprises can be prepared to implement new integrated applications immediately.This single-port, enhanced 24-channel T1 voice/fax network module supports 24 channels of high and medium complexity VoCoders.