NIM-4FXO – 4 Ports – Network Interface Module

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NIM-4FXO

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List Price: $983 $280.88
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Weight 1.2 kg
Dimensions 31 × 18 × 11 cm
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NIM-4FXO Description

Cisco NIM-4FXO is a 4-port Foreign Exchange Office (FXO) analog voice Network Interface Module for Cisco ISR 4000 Series routers. This universal FXO card adds four PSTN/PBX trunk interfaces with onboard DSP, supporting loop-start and ground-start signaling, caller ID with battery-reversal detection, up to 128-ms echo cancellation, and comprehensive codec, fax, and modem features. As a NIM, it supports online insertion and removal (OIR) on ISR 4300/4400 platforms and operates with the listed Cisco IOS XE releases. Synonyms and related terms: 4-port FXO NIM, analog PSTN trunk module for ISR 4000.

Key Features

Four FXO

analog ports provide reliable connectivity to PSTN and PBX systems, supporting both loop-start and ground-start signaling for global interoperability in enterprise and carrier networks.

Built-in DSP

delivers advanced voice processing without the need for motherboard PVDMs, enabling time-division multiplexed (TDM) analog voice, up to 128-ms echo cancellation, voice activity detection, comfort noise generation, and high call quality in diverse environments.

Extensive codec support

(G.711, G.729a, G.726, plus G.723 and iSAC with iLBC on roadmap) allows bandwidth-efficient voice compression, making the module suitable for branch offices with limited WAN capacity or high-density voice deployments.

Advanced enterprise telephony functions

such as caller ID, battery-reversal detection, call detail records (CDR), cable detection, and overload protection ensure secure and manageable analog trunk integration with modern Unified Communications.

Legacy device compatibility

includes fax relay with T.38, fax pass-through, and modem pass-through, supporting industries like healthcare, retail, and government that continue to rely on analog fax machines and legacy dial-up equipment.

Operational simplicity

and resiliency through online insertion and removal (OIR) on Cisco ISR 4300/4400 Series routers, combined with SNMP/MIB manageability, flexible IOS XE release support, and Unified Communications technology package integration.

Applications Scenarios

Branch office PSTN backup

Use FXO trunks on ISR 4000 for failover, E-911 CAMA trunks, or legacy PBX tie-lines alongside SIP/H.323.

Retail and hospitality integration

Attach fax machines and other analog devices while retaining CDR and manageability on ISR platforms.

Public sector and utilities

Maintain analog interop (caller ID, battery-reversal) during IP telephony migration and regulatory projects.

Product Comparison

Parameter

NIM-2FXO

NIM-4FXO

NIM-2FXS/4FXO

Port makeup

2× FXO

4× FXO

2× FXS + 4× FXO

Signaling (FXO)

Loop & ground start

Loop & ground start

Loop & ground start (FXO)

Caller ID (FXO)

Supported

Supported

Supported

Battery reversal detect (FXO)

Supported

Supported

Supported

On-module DSP

Yes

Yes

Yes

Echo cancellation

Up to 128 ms

Up to 128 ms

Up to 128 ms

Codecs

G.711/G.729a/G.726; G.723 & iSAC noted

Same

Same

Fax/modem

T.38; fax/modem pass-through

Same

Same

Interworking

SCCP, H.323, SIP, MGCP 1.0

Same

Same

OIR on ISR 4000

Supported

Supported

Supported

Minimum IOS XE (per table)

XE 3.13.4+

XE 3.13.4+

XE 3.14.3+

Weight

0.42 lb (191 g)

0.44 lb (200 g)

0.52 lb (236 g)

Specifications

Parameter Specification Parameter Specification
Model NIM-4FXO (4-port FXO Network Interface Module) Form factor NIM plug-in module for Cisco ISR 4000 Series
Ports 4 × FXO, RJ-11 connectors Interface type Foreign Exchange Office (FXO), universal type
Platform support Cisco ISR 4321, 4331, 4351, 4431, 4451 Online Insertion/Removal (OIR) Supported
Signaling Loop start, Ground start Caller ID / Polarity reversal Supported (Type I/II)
Voice codecs G.711 (A/μ-law), G.729a/b, G.726, G.723.1 Fax/Modem T.38 Fax Relay, Fax/Modem passthrough
Protocol interworking SIP, SCCP, H.323, MGCP 1.0 RTP features RTP/RTCP, RFC 4733 (DTMF relay)
Echo cancellation 128 ms tail length Voice optimizations VAD, CNG, cRTP (Compressed RTP)
DSP resources On-module DSP (no router PVDM required) Country configuration Software-selectable (global homologation)
Cabling 2-wire analog, straight-through RJ-11 Use cases PSTN access, analog PBX trunks, branch voice gateway
Minimum software Cisco IOS XE 3.13 or later (UC license) Management CLI (console/SSH), SNMP MIB-II, Cisco Prime Collaboration
Regulatory compliance TIA-968-B (US), CS-03 (CA), AS/CA S002/S003 (AU), TBR 21 (EU) Weight Approx. 0.46 lb (≈210 g)
Power consumption Under 10 W Operating temperature 0°C to 40°C (32°F to 104°F)
Ordering PID NIM-4FXO Warranty Per Cisco hardware standard warranty

Get More Information

Discover unbeatable prices and fast shipping for the NIM-4FXO Access the detailed NIM-4FXO datasheet and ensure you’re getting the best deal with our reliable delivery service. Need assistance? Our free live chat support is here to help. For more information about the product and pricing, contact us via Live chat or email us at [email protected]

Quality Certifications

Customer Reviews

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5.0
(3 reviews)
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    Gandalf
    Posted on 22/08/2024
    Verified Buyer
    5.0

    A swift arrival. The package was secure.

    IT Admin
    Posted on 12/04/2024
    Verified Buyer
    5.0

    Authentic Cisco module. Works as expected.

    Supply Chain
    Posted on 08/01/2024
    Verified Buyer
    5.0

    Inventory was accurate. Shipped immediately.

Questions & Answers

  • What is Cisco NIM-4FXO used for?

    NIM-4FXO provides four analog FXO trunk ports to connect an ISR 4000 to the PSTN. It’s ideal for backup dial tone, local emergency calling, or integrating legacy CO lines with Cisco UC.

  • How is NIM-4FXO different from NIM-4FXS?

    FXO interfaces connect to the telephone company central office, while FXS connects to analog devices like phones. Use FXO for incoming/outgoing PSTN lines; use FXS for local analog endpoints.

  • Does NIM-4FXO support battery reversal and disconnect supervision?

    Yes. It supports standard FXO supervision methods such as battery reversal and CPC, improving reliable call teardown and accurate call accounting.

  • Can I mix FXO and SIP trunks?

    Absolutely. Enterprises often keep NIM-4FXO trunks for resilience alongside SIP trunks on CUBE. Route lists and dial peers determine primary/backup behavior.

  • What about emergency calling (E911)?

    Route emergency calls over local FXO lines so responders receive correct location information. Configure dedicated dial peers for 911 and test under failover conditions.

  • How do I handle impedance and regional tones?

    IOS XE offers country-specific settings for tones, impedance, and caller ID formats. Set them to match local PSTN standards for best audio and signaling.

  • Is survivability supported?

    Combine FXO with SRST to retain critical calling if WAN/SIP fails. Analog trunks keep branches connected to local PSTN during outages.

  • Any limitations to consider?

    FXO channels are circuit-based and limited in concurrency. For high call volumes, SIP or PRI may be more efficient; use FXO primarily for backup and local presence.

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Resources Downloads

  • NIM-4FXO Datasheet

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