Cisco NIM-4FXSP=

Overview

The Cisco NIM-4FXSP= is a fourth-generation network interface module designed to add four analog voice and fax ports directly to Cisco ISR 4000 Series routers. It enables seamless integration of traditional telephones, fax machines, and analog trunks without the need for external gateways. This module supports online insertion and removal, allowing upgrades or replacements without powering down the router, which helps maintain continuous voice service and reduces maintenance windows.

With higher port density than previous models, it supports more analog endpoints on a single router, making it a practical choice for branch offices or small call centers that still rely on analog devices. The module operates on Cisco IOS software, allowing consistent configuration and management alongside other Cisco voice interfaces.

Key features

• Four analog voice and fax ports integrated into the router for direct connection of analog devices
• Online insertion and removal capability to minimize downtime during maintenance or upgrades
• Higher port density compared to earlier Cisco voice interface modules, supporting more analog endpoints per router
• Configurable through Cisco IOS software, enabling consistent dial peer, codec, and quality of service policies
• Supports a mix of analog calls with SIP or H.323 traffic, consolidating voice management on a single platform
• Ideal for maintaining legacy analog lines used for elevators, alarms, or fax workflows during network migration

Key specs

• Ports: 4 analog voice and fax ports
• Compatibility: Cisco ISR 4000 Series routers
• Software: Cisco IOS for configuration and management
• Insertion: Online insertion and removal supported
• Connection type: Standard RJ-11 cables for analog devices

Connectivity and compatibility

This module fits into the network interface slot of Cisco ISR 4000 Series routers, providing direct analog connectivity without external gateways. It supports standard RJ-11 connections for telephones, fax machines, and analog trunks, making it compatible with a wide range of legacy analog equipment. The integration with Cisco IOS software ensures it works seamlessly with existing voice infrastructure and protocols such as SIP and H.323.

Ideal uses and environments

The NIM-4FXSP= is well suited for branch offices and small enterprises that need to maintain analog voice and fax lines while transitioning to IP-based communications. It is a strong choice for environments where legacy devices like elevators, alarms, or fax machines must remain operational. Small call centers that continue to use analog handsets will also benefit from the module’s higher port density and simplified management through Cisco IOS.

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