NIM-2FXSP Cisco 2-Port FXS, FXS-E and DID Network Interface Module

NIM-2FXSP is the Cisco 2-Port Network Interface Module for FXS, FXS-E and DID analog voice, with two ports. The ISR G2 equivalent is the VIC3-2FXS/DID. The P suffix marks a version made necessary by a new hardware component in manufacturing, with no change in functionality from the non-P version.

Each port works as FXS or as DID. FXS ports connect directly to phones, fax machines and key systems, and generate battery polarity reversal and caller ID. In DID mode the ports serve only inbound calls from the PSTN and do not support caller ID. Long loop ports are configurable, and message waiting indicator and cable detection are supported.

The module has its own onboard DSP, so no packet voice DSP module is needed on the router motherboard, and echo cancellation reaches an echo tail of up to 128 ms. Clock-participate is not supported on FXS NIMs because of that DSP. FXS ports use a straight-through 2-wire cable, and the NIM has no jumpers to set.

It is supported on Cisco 4300 and 4400 Series ISRs with Cisco IOS XE Release 16.5 and above, and is not supported on the Cisco 2900 and 3900 Series ISRs. Voice applications need at minimum the optional Unified Communications technology package. The module supports online insertion and removal without powering off the router. The FXS NIMs are an Off-Premises Extension Lite offering, not in full compliance for off-premises use.

Related part: NIM-4FXO Cisco 4-Port FXO Analog Voice Network Interface Module

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