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Farhan Aziz
5
FXS ports provided stable analog phone connectivity.
NIM-4FXS
Cisco 4-Port Network Interface Module - FXS. FXS-E and DID,...
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Name:
NIM-4FXS
- Description:
- Cisco 4-Port Network Interface Module - FXS. FXS-E and DID, for ISR4451-X
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 582723344703
- Condition:
- Warranty:
- 3
- List Price:
$1,150.00
- Price:
$417.0063.7% off
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1
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NIM-4FXS Overview
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.
NIM-4FXS Specifications
- Product Type
- Network Module
- Module Type
- FXS Telephony Module
- Data Rate
- N/A
- Connector Type
- FXS
- Supported Protocols
- SIP / H.323
- Form Factor
- Modular (NIM)
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 12V
- Compatibility
- Cisco / Avaya
- Max Speed
- N/A
- Supported Features
- Caller ID / Hook Flash / Auto-Ringing
- Power Consumption
- 8W
- Interface Ports
- FXS
- Expansion Slots
- NIM
- Product Name
- NIM-4FXS
- Height
- 1.5 inches
- Width
- 5.0 inches
- Depth
- 7.0 inches
- Weight
- 1.2 lbs
NIM-4FXS Use Case
Branch Office Analog Phone Integration with Unified VoIP
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.
PSTN Failover and Business Continuity for Remote Sites
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.
Retail POS and Fax Machine Connectivity with Direct Inward Dialing
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.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 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 |
| Data Rate | N/A | 10Gbps | 1Gbps | 1Gbps / 10Gbps | 1.544 Mbps (T1) / 2.048 Mbps (E1) |
| 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 |
| Max Speed | N/A | 10Gbps | 1Gbps | 10Gbps | 2.048 Mbps |
| 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 |
| Expansion Slots | NIM | NIM | N/A | PCIe | NIM |
| Product Name | NIM-4FXS | NIM-4FXSP | SM-X-6X1G Ethernet Module | SM-X-4X1G-1X10G | NIM-4MFT-T1/E1= |
| Height | 1.5 inches | N/A | 0.5 inches | N/A | N/A |
| Width | 5.0 inches | N/A | 3.4 inches | N/A | N/A |
| Depth | 7.0 inches | N/A | 4.4 inches | N/A | N/A |
| Weight | 1.2 lbs | N/A | 0.8 lbs | N/A | N/A |
Reviews & Ratings
H
Helen Moore
4
Call quality remained consistent under load.
S
Saif Ali
5
Easy installation and quick configuration.
R
Robert Young
3
Good density for small voice deployments.
M
Mehwish Iqbal
4
Reliable Cisco voice module.
F
Farhan Aziz
5
FXS ports provided stable analog phone connectivity.
H
Helen Moore
5
Call quality remained consistent under load.
S
Saif Ali
4
Easy installation and quick configuration.
R
Robert Young
5
Good density for small voice deployments.
M
Mehwish Iqbal
3
Reliable Cisco voice module.
Questions & Answers
What is Cisco NIM-4FXS (SKU: NIM-4FXS) for the ISR4451-X?
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.
Which key features does the Cisco NIM-4FXS offer?
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.
Which Cisco routers are compatible with the NIM-4FXS module?
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.
How many analog ports does the NIM-4FXS provide?
The module provides four independent FXS ports, each delivering POTS voice connectivity and signaling for analog devices.