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NIM-4FXS
Cisco 4-Port Network Interface Module - FXS. FXS-E and DID,...
Federal agencies and Fortune 500 operations source through ORM Systems.
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Ten years serving buyers who audit their vendors. From federal agencies to 20,000+ enterprise clients worldwide.
NIM-4FXS is a high-performance telephony interface module designed to integrate seamlessly with unified communications systems by delivering four reliable FXS ports for connecting standard analog telephones. Built as a modular Network Interface Module (NIM), it is engineered to support analog voice communications over traditional FXS pathways while ensuring compatibility with leading routers, switches, and unified communications platforms.
The NIM-4FXS module supports essential VoIP protocols such as SIP and H.323, making it ideal for environments that require smooth migration from legacy telephony systems to modern IP-based communications. Its compact form factor and straightforward installation process allow network operators to efficiently expand their voice service capabilities and upgrade existing infrastructures without compromising reliability or performance.
NIM-4FXS price is $417.00, a 63.7% saving from the Cisco list price of $1,150.00. NIM-4FXS is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for NIM-4FXS for additional pricing. Browse the full Cisco Isr 4000 Router Modules & Cards series or explore all Cisco products.
In a large enterprise rolling out VoIP across 50+ branch offices, the NIM-4FXS-Cisco 4-Port Network Interface Module - FXS on the ISR4451-X enables direct connection of existing analog phones and overhead paging systems. By preserving legacy handsets and leveraging Cisco Unified Communications Manager, IT teams avoid costly handset replacements and accelerate migration schedules. Benefit: Achieve seamless analog-to-VoIP convergence with 30% lower deployment costs and centralized management.
A regional bank equips 120 remote kiosks with ISR4451-X routers fitted with the NIM-4FXS-Cisco 4-Port Network Interface Module - FXS to provide local PSTN fallback trunks. During WAN outages or SIP provider interruptions, inbound/outbound calls automatically reroute over analog lines via FXS ports. Benefit: Maintain 99.95% voice uptime SLA, protect critical customer service operations, and ensure uninterrupted transaction flows.
A multisite retail chain integrates point-of-sale terminals, credit-card readers, and inbound fax machines into their new ISR4451-X network by deploying the NIM-4FXS-Cisco 4-Port Network Interface Module - FXS with DID support. Each analog device receives a unique direct extension from the head office PBX, streamlining order processing and compliance with PCI DSS regulations. Benefit: Optimize retail workflows, reduce reconciliation errors by 40%, and enhance customer checkout experiences.
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| NIM-4FXS |  NIM-4FXSP |  SM-X-6X1G |  SM-X-4X1G-1X10G |  NIM-4MFT-T1/E1 | |
|---|---|---|---|---|---|
| Product Type | Network Module | Network Module | Network Module / Network Card | Network Module / Network Card | Network Interface Module |
| Module Type | FXS Telephony Module | Ethernet | Ethernet | Ethernet | T1/E1 Interface Card |
| Connector Type | FXS | SFP+ | RJ-45 | SFP+ | RJ-48 |
| Supported Protocols | SIP / H.323 | TCP/IP | TCP/IP | TCP/IP | T1/E1 Framing and Signaling |
| Form Factor | Modular (NIM) | PCIe | PCIe | PCIe | Modular |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 12V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Cisco / Avaya | Cisco, Juniper, Arista, Dell, HP | Cisco, Juniper, Arista, Dell, HP | Cisco / Juniper / Arista / Dell / HP | Cisco Routers |
| Supported Features | Caller ID / Hook Flash / Auto-Ringing | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation / Jumbo Frames / QoS | Plug-and-play installation, Redundant design |
| Power Consumption | 8W | 15W | 2.5W | 8W | 5W |
| Interface Ports | FXS | 4 x SFP+ | Ethernet | Ethernet / SFP+ | T1/E1 |
| Product Name | NIM-4FXS | NIM-4FXSP | SM-X-6X1G Ethernet Module | SM-X-4X1G-1X10G | NIM-4MFT-T1/E1 |
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FXS ports provided stable analog phone connectivity.
Call quality remained consistent under load.
Easy installation and quick configuration.
Good density for small voice deployments.
Reliable Cisco voice module.
FXS ports provided stable analog phone connectivity.
Call quality remained consistent under load.
Easy installation and quick configuration.
Good density for small voice deployments.
Reliable Cisco voice module.
The Cisco NIM-4FXS is a 4-port analog FXS Network Interface Module designed for the ISR4451-X, providing voice connectivity for analog phones, fax machines, and telephony applications.
The NIM-4FXS supports four FXS ports, optional FXS-E signaling, Direct Inward Dialing (DID), industry-standard voice codecs, echo cancellation, and integrated DSP resources for high-quality voice services.
The NIM-4FXS is officially supported on the Cisco ISR4451-X platform and selected ISR4000 Series routers running IOS XE 16.6.1 or later.
The module provides four independent FXS ports, each delivering POTS voice connectivity and signaling for analog devices.
Yes, the NIM-4FXS supports DID signaling, enabling direct extension dialing from the PSTN to individual analog endpoints.
Power down the ISR4451-X, remove the blank NIM slot cover, align and insert the NIM-4FXS module, secure the captive screws, then power up the router.
No, the NIM-4FXS requires the ISR4451-X to be powered down before installation or removal to ensure module integrity and avoid service disruption.
The NIM-4FXS consumes approximately 5W of router power when fully loaded and is supported by the ISR4451-X internal power supply.
The NIM-4FXS supports G.711 μ-law/A-law, G.729, G.723.1, G.726, and low-bit-rate codecs for interoperable analog-to-IP voice conversion.
Yes, the four FXS ports allow direct connection of standard analog telephones, fax machines, and credit card terminals without additional adapters.
Use voice-port configuration mode to define FXS ports, then create POTS and VoIP dial peers with matching port and codec parameters to route calls.
No additional module license is required; voice features run under the ISR4451-X universal IOS XE license, with optional Security or Unified Communications upgrades as needed.
Integrated DSPs provide echo cancellation, jitter buffering, and packet loss concealment, ensuring clear voice calls over converged networks.
Typical uses include branch office analog phone connectivity, fax relay, emergency phone lines, and legacy equipment integration in unified communications deployments.
Yes, the module includes hardware-based G.168 echo cancellation to meet carrier-grade voice quality requirements.
Cisco offers a one-year limited hardware warranty with the option to upgrade to Cisco SMARTnet for 24x7 support, software updates, and advance replacement.
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