NIM-4FXO 4-port Network Interface Module - FXO (Universal)

Cisco NIM-4FXO - 4-Port FXO Voice Interface Module

The Cisco NIM-4FXO is a voice network interface module designed for Cisco ISR 4000 Series routers. It provides four FXO (Foreign Exchange Office) ports, enabling flexible voice connectivity for branch offices and enterprise environments. This module allows integration of PSTN lines and PBX trunks into IP-based networks, making it ideal for hybrid telephony deployments.

🔧 Key Specifications

• Model: NIM-4FXO
• Interfaces:
  • 4x FXO ports (connect to PSTN lines or PBX trunks)
• Compatibility: Cisco ISR 4000 Series routers
• Features:
  • Hot-swappable module
  • Supports analog voice connectivity for IP telephony integration
  • Enables branch offices to connect PSTN lines into VoIP systems
  • Centralized management via Cisco IOS XE
• Form Factor: Network Interface Module (NIM)
• Dimensions: Standard NIM slot size for ISR 4000 chassis
• Power: Draws power from host router

🧩 Ideal Use Cases

• Branch offices needing PSTN line integration into IP networks
• Enterprises migrating from legacy telephony to VoIP while retaining analog connectivity
• Environments requiring PBX trunk access alongside IP telephony
• Organizations seeking modular, scalable router interfaces for voice services

⚙️ Licensing & Expansion
The NIM-4FXO requires a compatible Cisco ISR 4000 router chassis. No additional license is required beyond the router’s software feature set.