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Cisco NIM-2FXS/4FXO Analog Voice Interface Module
CISCO
Product Specification
| Brand | CISCO |
| SKU | MOD-CISCO-NIM-2FXS4FXO |
| Ports | 2x FXS and 4x FXO |
| Module Type | Cisco Network Interface Module |
| Compatibility | Cisco ISR Routers |
| Function | Analog Voice Connectivity |
| Use Case | Voice Gateway Expansion Module |
| Integration | PSTN Integration |
| Deployment | Enterprise Voice Deployment |
| Installation | Hot Swappable Module |
About This Product
Overview
The Cisco NIM-2FXS/4FXO Analog Voice Interface Module is designed to add analog voice connectivity to supported Cisco ISR routers. As a network interface module, it provides a practical way to expand voice gateway capabilities in environments that still rely on analog telephony or PSTN connections. With 2 FXS and 4 FXO ports, this module supports a mix of analog endpoints and external line connections, making it suitable for enterprise voice deployments that need flexible integration with existing communications infrastructure. Its hot-swappable design also helps simplify installation and replacement in compatible systems, which is valuable in managed network environments where uptime and service continuity matter.
Performance & Scalability
Built for Cisco ISR routers, this analog voice interface module helps extend voice services without requiring a separate standalone gateway for every deployment scenario. The combination of FXS and FXO ports supports a range of analog voice use cases, including connection to analog phones, fax devices, and PSTN lines where applicable. For organizations maintaining hybrid voice environments, the module can help bridge legacy analog systems with IP-based infrastructure in a controlled and scalable way. Because it is intended as a voice gateway expansion module, it can be used to adapt router-based voice platforms to changing business needs while keeping the deployment aligned with Cisco hardware already in place.
Storage Flexibility
While this product is not a storage device, it offers flexibility at the network edge by expanding the voice capabilities of compatible Cisco ISR routers. That flexibility is important for organizations that need to support analog voice connectivity alongside modern network services. By adding the module to an existing router platform, IT teams can preserve useful legacy voice connections and integrate them into a broader communications strategy without redesigning the entire environment. The module’s support for PSTN integration makes it especially useful in mixed infrastructure setups where analog and digital voice services must work together.
Why Choose This Product?
The Cisco NIM-2FXS/4FXO is a strong choice for businesses that need dependable analog voice expansion within a Cisco-based network. It is well suited for enterprise voice deployment, PSTN integration, and environments where a hot-swappable module can streamline maintenance. For IT teams managing Cisco ISR routers, this module provides a straightforward way to add or extend analog voice services while keeping the solution within the Cisco ecosystem. Its defined port mix and network module design make it a practical option for organizations looking to support legacy voice devices and external line connectivity in a compact, router-based form factor.
Frequently Asked Questions
What does the Cisco NIM-2FXS/4FXO module do?
It adds analog voice connectivity to compatible Cisco ISR routers for voice gateway expansion and PSTN integration.
How many ports does this module include?
This module includes 2 FXS ports and 4 FXO ports.
Is this module compatible with Cisco ISR routers?
Yes, it is designed for use with Cisco ISR routers.
Can this module be used for PSTN integration?
Yes, PSTN integration is one of the supported use cases for this analog voice interface module.
Is the module hot swappable?
Yes, the product notes indicate that it is a hot-swappable module.
Why Buy a Refurbished Products?
Refurbished enterprise servers offer enterprise-grade performance at a fraction of the new price.
Up to 70% Cost Savings
Refurbished R650xs units deliver identical hardware capability to new, at significantly lower upfront cost — freeing budget for CPUs, RAM, and storage.
Fully Tested & Verified
Every unit undergoes comprehensive hardware diagnostics before dispatch. POST tests, burn-in, memory checks, and power supply verification are standard.
Immediate Availability
Unlike new enterprise servers with lead times of weeks or months, refurbished stock is ready to ship within 24 hours of ordering.
Same Performance
The hardware inside the R650xs performs identically whether purchased new or refurbished. The 3rd Gen Xeon platform, PCIe Gen4, and iDRAC9 are unchanged.