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Cisco NIM-2FXS/4FXO Analog Voice Interface Module
Inclusive of VAT · Warranty included
CISCO
Product Specification
| Brand | CISCO |
| SKU | MOD-CISCO-NIM-2FXS4FXO |
| Ports | 2x FXS and 4x FXO Ports |
| Module Type | Cisco Network Interface Module |
| Function | Supports Analog Voice Connectivity |
| Compatibility | Compatible with Cisco ISR 4000 Series Routers |
| Use Case | Voice Gateway Expansion Module |
| Integration | Supports PSTN Integration |
| Deployment | Enterprise Voice Deployment |
| Feature | Hot Swappable Module |
About This Product
Overview
The Cisco NIM-2FXS/4FXO Analog Voice Interface Module is designed to expand voice connectivity on compatible Cisco ISR 4000 Series routers. Built as a network interface module, it provides a practical way to add analog voice support to an existing router platform without changing the core system design. With 2 FXS and 4 FXO ports, this module is suited for environments that need to connect analog telephones, fax devices, or PSTN lines as part of a broader voice deployment. It is a useful option for organizations that want to extend voice services while keeping their Cisco infrastructure centralized and manageable. Because it is intended for enterprise voice deployment, it fits into business networks where reliable analog integration remains important alongside IP-based communications.
Performance & Scalability
This module supports analog voice connectivity in a compact form factor that works with Cisco ISR 4000 Series routers, helping organizations scale voice capabilities as requirements grow. The combination of FXS and FXO ports allows the module to support both endpoint connections and PSTN access, making it flexible for mixed voice environments. For businesses expanding branch office communications or integrating legacy analog services into a modern network, the module can help bridge those needs within the router platform. Its hot swappable design also supports easier maintenance and deployment planning, which can be valuable in environments where minimizing disruption matters. As part of a voice gateway expansion strategy, it offers a straightforward way to add functionality without introducing a separate standalone system.
Storage Flexibility
While this product is not a storage device, its modular design provides flexibility in how voice infrastructure is deployed and maintained. The Cisco NIM-2FXS/4FXO module can be added to compatible ISR 4000 Series routers to support analog voice services where needed, allowing organizations to adapt their network edge without redesigning the entire environment. This makes it useful for deployments that need to preserve existing analog connections while transitioning toward more integrated communications systems. The module’s role in PSTN integration also helps support environments that still rely on traditional telephony paths, giving IT teams a practical option for mixed technology setups.
Why Choose This Product?
The Cisco NIM-2FXS/4FXO Analog Voice Interface Module is a strong choice for businesses that need dependable analog voice expansion within a Cisco router environment. It combines FXS and FXO connectivity, PSTN support, and compatibility with Cisco ISR 4000 Series routers in one module designed for enterprise use. For organizations managing voice gateway requirements, it offers a focused solution that supports analog endpoints and external line integration while fitting into existing Cisco infrastructure. Its hot swappable design adds convenience for deployment and serviceability, making it a practical addition for network teams looking to maintain flexibility and continuity in voice communications.
About this module
Cisco NIM-2FXS/4FXO analogue voice interface module with two FXS and four FXO ports for ISR routers, adding PSTN lines and analogue handsets. Tested and stocked in Doha, delivered across Qatar within a day.
The NIM-2FXS/4FXO is a network interface module for Cisco ISR routers that adds six analogue voice ports: two FXS ports that provide dial tone to analogue telephones, fax machines or door entry systems, and four FXO ports that connect the router to ordinary PSTN lines from the telephone company. It fits the NIM slot of the ISR 4000 series and can be inserted or removed without powering the router down.
Businesses in Qatar add this refurbished module to a voice enabled ISR when they need to keep analogue lines alongside an IP phone system, either for fax and emergency lines or as the trunk to the public network where SIP trunking is not yet in place. ServerDove keeps it in Doha stock with the routers it serves.
- FXS ports
- 2
- FXO ports
- 4
- Module type
- Cisco NIM
- Platform
- Cisco ISR routers
- Installation
- Hot swappable
Specification
FXS and FXO are opposite ends of an analogue line: FXS ports behave like the telephone exchange and feed a phone, FXO ports behave like a phone and plug into a line. This module gives two of the former and four of the latter, a mix suited to a small office with a couple of analogue devices and up to four incoming lines.
| Product type | Analogue voice interface module |
| Ports | 2 x FXS, 4 x FXO |
| Module type | Cisco network interface module, NIM |
| Compatibility | Cisco ISR routers with a NIM slot |
| Function | Analogue voice connectivity |
| Integration | PSTN |
| Installation | Hot swappable |
The router must have DSP resources, a PVDM module, to process calls on these ports, and a voice feature licence. FXO ports on their own do not detect the end of a call reliably on every line type, so configure disconnect supervision to match the local telephone service.
A common layout puts the four FXO ports on the incoming PSTN lines so calls from the public network reach IP phones through the router, and uses the FXS ports for a fax machine and a lift or lobby phone that must keep working during a network outage. Caller ID and line impedance are set per port to suit the local telephone service.
Part numbers and identification
Cisco writes the part number with a slash, and the letters give the port mix directly. Buyers search for "NIM-2FXS/4FXO", "NIM 2FXS 4FXO" and "Cisco 2 FXS 4 FXO module".
| SKU | MOD-CISCO-NIM-2FXS4FXO |
| Cisco part number | NIM-2FXS/4FXO |
| Module family | Cisco NIM |
In the box
- The part as described, with the part number shown
Images are for illustration. The unit supplied is the one described in the specification and may differ cosmetically.
Not included
- The server or system it installs into
- Mounting hardware, screws or caddies unless listed
- Cables unless listed
Frequently Asked Questions
What does the Cisco NIM-2FXS/4FXO module do?
It adds analog voice connectivity to compatible Cisco ISR 4000 Series routers.
How many ports does this module include?
This module includes 2 FXS ports and 4 FXO ports.
Is this module compatible with Cisco ISR 4000 Series routers?
Yes, it is listed as compatible with Cisco ISR 4000 Series routers.
Can this module be used for PSTN integration?
Yes, it supports PSTN integration for enterprise voice deployments.
Is the module hot swappable?
Yes, the provided product details list it as a hot swappable module.
Why buy refurbished?
Enterprise-grade performance at a fraction of the price of new.
Fully tested and verified
Every unit goes through hardware diagnostics before dispatch: POST tests, burn-in, memory checks and power supply verification.
Enterprise performance for less
Refurbished units deliver the same hardware capability as new, at significantly lower upfront cost, freeing budget for CPUs, memory and storage.
Available now
New enterprise hardware carries lead times of weeks or months. Our stock is held in Doha and ready to ship within 24 hours.
Backed by support
Warranty on every unit we sell, with installation and ongoing hardware support available across Qatar.