2FXO Ports For PSTN Backup & VoIP Integration Cisco NIM-2FXO Module
The Cisco NIM-2FXO Module is a high-performance Network Interface
Module (NIM) designed for Cisco ISR 4000 Series routers, enabling
seamless integration of traditional PSTN (FXO) lines with modern
VoIP networks. Ideal for businesses transitioning to IP telephony
while maintaining analog fallback, this module ensures reliable
voice connectivity, enhanced redundancy, and cost-effective
migration.
Key Features & Benefits
✔ Dual FXO Ports – Connect two PSTN lines for analog telephony
backup or hybrid deployments.
✔ VoIP & PSTN Integration – Supports Cisco Unified Communications
Manager (CUCM) for smooth IP telephony migration.
✔ Failover & Redundancy – Automatically switches to PSTN if IP
network fails, ensuring uninterrupted business communications.
✔ Enterprise-Grade Voice Quality – Features echo cancellation,
noise reduction, and QoS prioritization for crystal-clear calls.
✔ Flexible Deployment – Hot-swappable NIM module for easy
installation in Cisco ISR 4321, 4331, 4351, and 4431 routers.
✔ Secure & Scalable – Supports SIP, H.323, and SRTP/TLS encryption
for secure voice transmission.
Technical Specifications (NIM-2FXO=)
| Parameter | Details |
|---|
| Ports | 2 x FXO (RJ-11) |
| Compatibility | Cisco ISR 4000 Series |
| Protocols | SIP, H.323, MGCP |
| Voice Codecs | G.711, G.729, G.726 |
| QoS Support | DSCP, ToS, LLQ |
| Security | SRTP, TLS, SIP over TLS |
| Dimensions | 1.5 x 4.5 x 4.3 in (HxWxD) |
Ideal Use Cases
Businesses needing PSTN backup for VoIP systems.
Branch offices requiring analog telephony support.
Hybrid UC deployments with Cisco Unified Communications.
Why Choose Cisco NIM-2FXO?
As part of Cisco’s reliable networking ecosystem, this module
ensures future-proof voice solutions with scalability, security,
and seamless integration. Whether upgrading legacy systems or
ensuring failover reliability, the NIM-2FXO module delivers
enterprise-grade performance.
Upgrade your voice infrastructure today with Cisco’s trusted NIM
technology!
