Manufacturer: Cisco Systems, Inc. Manufacturer Part Number: NIM-2FXS/4FXO=. Brand Name: Cisco. Product Name: Voice Interface Card (VIC). Product Type: Voice Interface Card (VIC). [Technical Information] Application/Usage: Voice. [Interfaces/Ports] Interfaces/Ports Details: 2 x FXO Network. 4 x FXS Network. [Miscellaneous] Compatibility: Cisco 4451-X Integrated Services Router.