NM-HD-1V= Cisco Systems 1-slot IP Communications voice and fax Network Module

NM-HD-1V= Overview

The Cisco IP Communications voice/fax network modules provide enterprises, managed service providers, and service providers the ability to directly connect the public switched telephone network (PSTN) and traditional telephony equipment (private branch exchange [PBX], key system, analog telephones, fax machines, etc.) to Cisco 2800, 2900, 3800 and 3900 Series Unified Communications routers.The Cisco IP Communications voice/fax network module for the Cisco 2600XM Series, Cisco 2691, and Cisco 3600 and 3700 series voice gateway routers enable packet voice technologies including VoIP (H.323, Media Gateway Control Protocol (MGCP), and Session Initiation Protocol (SIP)), voice over Frame Relay, and voice over ATM (ATM Adaptation Layer 2 (AAL2) and AAL5).