Cisco NIM-4FXO 4-port Network Interface Module - FXO for ISR 4000 Series Routers NIM4FXO

DESCRIPTION:
The Cisco NIM-4FXO is a 4-port Foreign Exchange Office (FXO) voice Network Interface Module designed for Cisco 4000 Series Integrated Services Routers (ISRs). It connects the router to the Public Switched Telephone Network (PSTN) through analog phone lines, allowing seamless integration of legacy telephony systems into modern IP-based networks. Ideal for businesses migrating to VoIP while retaining analog line access for backup or local calling.

TECHNICAL SPECIFICATIONS:
Brand: Cisco
Model: NIM-4FXO
Type: Network Interface Module (NIM)
Ports: 4 x FXO analog ports
Function: Connects to the PSTN for analog voice services
Compatibility: Cisco ISR 4000 Series routers (e.g., 4321, 4331, 4351, 4431, 4451)
Signaling Support: Loop start, ground start, caller ID
Echo Cancellation: G.168 compliant
Voice Protocols: SIP, H.323, MGCP, SCCP (with appropriate voice software licensing)
Module Type: Pluggable into NIM slots on supported routers
Power Requirements: Supplied through router chassis
Part Number: NIM-4FXO