NIM-2FXS/4FXO 2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module

Cisco NIM-2FXS/4FXO - 2-Port FXS + 4-Port FXO Voice Interface Module

The Cisco NIM-2FXS/4FXO is a voice network interface module designed for Cisco ISR 4000 Series routers. It provides two FXS (Foreign Exchange Station) ports and four FXO (Foreign Exchange Office) ports, enabling flexible voice connectivity for branch offices and enterprise environments. This module allows integration of analog phones, fax machines, and PSTN lines into IP-based networks.

🔧 Key Specifications

• Model: NIM-2FXS/4FXO
• Interfaces:
  • 2x FXS ports (connect analog phones, fax machines, or PBX systems)
  • 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 legacy analog devices to 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 integration of analog phones and PSTN lines into IP networks
• Enterprises migrating from legacy telephony to VoIP while retaining analog devices
• Environments requiring fax machine or PBX connectivity alongside IP telephony
• Organizations seeking modular, scalable router interfaces for voice services

⚙️ Licensing & Expansion
The NIM-2FXS/4FXO requires a compatible Cisco ISR 4000 router chassis. No additional license is required beyond the router’s software feature set.