The Cisco® 4000 Series Integrated Services Routers (ISRs) host the Cisco network interface modules (NIMs), which have evolved from the enhanced high-speed WAN interface card (EHWIC), increasing port density and module capability. Up to three integrated NIM slots on the 4000 Series allow for flexible configurations. The NIMs support online insertion and removal (OIR), reducing the downtime required for new or replacement modules. Manufacturer: Cisco Systems, Inc. Manufacturer Part Number: NIM-4FXSP. Brand Name: Cisco. Product Name: 4-Port Network Interface Module - FXS, FXS-E and DID. Product Type: Voice Interface Card (VIC). [Technical Information] Application/Usage: Voice. [Interfaces/Ports] Interfaces/Ports Details: 4 x FXS/DID Network. [Miscellaneous] Compatibility: Cisco 4000 Series Integrated Services Routers.