CISCO NIM-4FXS 4-port Network Interface Module FXS for ISR 4000 Series Routers

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Cisco NIM-4FXS 4-Port Network Interface Module - FXS, FXS-E and DID

CISCO NIM-4FXO 4-port Network Interface Module VOICE FXO ISR4000 Series Routers

CISCO NIM-4FXS 4-port Network Interface Module FXS for ISR 4000 Series Routers

Cisco Model NIM-4FXO 4-Port Analog Voice Module For ISR 4000s

CISCO NIM-4FXS 4-port Network Interface Module FXS for ISR 4000 Series Routers

Cisco VIC2-4FXO 4Port FXO Voice Interface Card