1-Slot Voice/Fax Module

Cisco Voice Network Modules provide enterprises, managed service providers, and service providers the ability to directly connect the public switched telephone network (PSTN) and legacy telephony equipment to existing Cisco 2600, Cisco 3600, and Cisco 3700 routers. The NM-1V and NM-2V carrier modules support Voice Interface Cards (VICs) to provide this connectivity. The NM-1V and NM-2V carrier modules do not support WAN Interface Cards (WICs), which are data-only interface cards. The "V" in the product name indicates that these are voice carrier modules. The WIC carrier module product numbers are NM-1W and NM-2W. The following features are available with the components listed:Voice/fax over IPRouter-based, modular designHigh-performance digital signal processing (DSP) architectureCisco IOS® quality of service (QoS) features: Resource Reservation Protocol (RSVP), weighted fair queuing (WFQ), fragmentation, and interleaveCompliant with the H.323 standard for audio and videoconferencingWorks with existing phone and fax equipmentVoice features require a Cisco IOS Plus feature set