Cisco NIM-2FXS/4FXO
Cisco NIM-2FXS/4FXO 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module Analog voice network interface card
For the ISR 4461 4451-X 4431 4351 4331 4321 4221*
Cisco NIM-2FXS/4FXO 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module Analog voice network interface card
For the ISR 4461 4451-X 4431 4351 4331 4321 4221*