NIM-2FXS – 2 Port – Network Interface Module – FXS,FXS-E and DID

Brand: Category: Availability: In Stock Model:

NIM-2FXS

(3 customer reviews)
Questions

19/mo Solds

List Price: $983 $228.25
  • 100% Genuine
    Original, factory-authenticated
  • S/N Verifiable
    Verified by official serial-check
Condition New Factory Sealed Related Quantity
Trusted & Secure Payments
Shipping Express Shipping 2-6 Days, via DHL, FedEx, UPS, etc. Packaging weight and dimensions included:
layer23-switch
Certified Expertise for Project Delivery

CCIE · JNCIE · NSE7 · ACDX · HPE · Dell Server/AI Expert

Stable Global Supply Chain for Thriving Businesses.

  • $3,000,000 Inventory
  • Certified Cisco Partner ships
  • Collaborating with FedEx, UPS, DHL

Free Expert Support from Planning to Deployment

  • Assistance with product selection and network solution design
  • Configuration guidance and best-practice recommendations
  • Troubleshooting support provided by CCIE-level technical experts

Established Global IT Distributor

With over a decade of industry experience, we are a certified Cisco Partner delivering genuine enterprise networking hardware and trusted services to system integrators, ISPs, and enterprises worldwide.

NIM-2FXS Description

Cisco NIM-2FXS is a two-port Foreign Exchange Station (FXS) analog voice Network Interface Module for Cisco ISR 4000 Series routers. The universal FXS card can operate as standard FXS or DID (inbound-only) to connect analog phones, fax machines, key systems and off-premises extensions. With onboard DSP, NIM-2FXS delivers echo cancellation up to 128 ms, broad codec support, T.38 fax, modem pass-through, and caller-ID/polarity features. It supports online insertion and removal (OIR) on ISR 4300/4400 platforms and interoperates with SCCP, H.323, SIP and MGCP-based Unified Communications.

Key Features

Dual FXS Analog Ports with DID Capability

Equipped with two Foreign Exchange Station ports that can also operate as Direct Inward Dial (DID) interfaces, allowing seamless connection of analog phones, fax machines, key systems, and inbound-only DID lines from the PSTN.

Integrated DSP for Advanced Voice Processing

Onboard digital signal processor eliminates the need for external PVDMs, enabling time-division multiplexed (TDM) analog voice, echo cancellation up to 128 ms, voice activity detection, comfort noise generation, and consistent call quality in demanding environments.

Comprehensive Codec Support for Bandwidth Efficiency

Supports industry-standard codecs such as G.711, G.729a, G.726, along with G.723 and iSAC, ensuring flexible bandwidth optimization and compatibility with diverse WAN conditions and enterprise telephony deployments.

Enhanced Enterprise Telephony Features

Provides caller-ID generation, battery polarity reversal, Message Waiting Indicator (MWI), cable detection, and long-loop support, enabling integration with legacy telephony devices while ensuring reliable and manageable station operation.

Legacy Device and Fax/Modem Compatibility

Built-in support for T.38 fax relay, fax pass-through, and modem pass-through ensures continued use of analog fax machines and legacy dial-up devices in sectors such as healthcare, government, utilities, and retail.

Simplified Operations and Unified Communications Integration

Supports online insertion and removal (OIR) for minimal downtime, SNMP/MIB-based manageability, and full interoperability with SCCP, H.323, SIP, and MGCP 1.0 protocols under Cisco IOS XE software, ensuring smooth integration into modern Unified Communications environments.

Applications Scenarios

Branch office analog endpoints

Connect analog phones/faxes, or off-premises extensions while migrating to IP telephony, with DID for inbound call delivery.

Hospitality and retail operations

Integrate front-desk phones, back-office fax lines, and analog devices with MWI/caller-ID while central call control runs on UC platforms.

Public sector and healthcare

Maintain compliant analog lines (fax/modem) for records, alarms, and specialty devices alongside SIP/H.323 voice.

Product Comparison

Parameter

NIM-2FXS

NIM-4FXS

NIM-2FXS/4FXO

Port makeup

2× FXS (FXS or DID)

4× FXS (FXS or DID)

2× FXS (FXS/DID) + 4× FXO

DID capability

Yes (inbound only)

Yes (inbound only)

Yes on FXS ports

Message Waiting Indicator (MWI)

Supported

Supported

Supported

Long-loop support

Configurable long loop

Configurable long loop

Configurable long loop

Caller-ID / polarity

Generates caller-ID, battery polarity reversal

Same

Same (FXS generates CID; FXO receives)

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

Protocol interworking

SCCP/H.323/SIP/MGCP 1.0

Same

Same

OIR on ISR 4000

Supported

Supported

Supported

Minimum IOS XE

3.13.4+

3.13.4+

3.14.3+

Typical use

Analog phones/fax, DID

Higher port density FXS/DID

Mixed FXS stations + FXO trunks

Weight

0.42 lb (191 g)

0.44 lb (200 g)

0.52 lb (236 g)

Specifications

Parameter Specification Parameter Specification
Model NIM-2FXS (2-port FXS Network Interface Module) Form factor NIM plug-in module for Cisco ISR 4000 Series
Ports 2 × FXS, RJ-11 connectors Interface type Foreign Exchange Station (FXS), universal
Platform support Cisco ISR 4321, 4331, 4351, 4431, 4451 Online Insertion/Removal (OIR) Supported
Typical devices connected Analog phones, fax machines, modems, or key systems Loop current 20 mA to 30 mA
Signaling Loop start, Ground start Ring voltage Up to 75 Vrms, 20–25 Hz
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 Analog device connectivity for voice gateway, branch office telephony
Minimum software Cisco IOS XE 3.13 or later (UC license) Management CLI (console/SSH), SNMP, Cisco Prime Collaboration
Regulatory compliance TIA-968-B (US), CS-03 (CA), AS/CA S002/S003 (AU), TBR 21 (EU) Weight Approx. 0.42 lb (≈190 g)
Power consumption Under 10 W Operating temperature 0°C to 40°C (32°F to 104°F)
Ordering PID NIM-2FXS Warranty Per Cisco hardware standard warranty

Get More Information

Discover unbeatable prices and fast shipping for the NIM-2FXS Access the detailed NIM-2FXS 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

Write A Review
5.0
(3 reviews)
5 Stars
3
4 Stars
0
3 Stars
0
2 Stars
0
1 Stars
0
    Frodo Baggins
    Posted on 05/06/2024
    Verified Buyer
    5.0

    It’s a small package, but it arrived safely. Thank you.

    Field Tech
    Posted on 20/02/2024
    Verified Buyer
    5.0

    Good price and availability. Reliable seller.

    Procurement
    Posted on 28/11/2023
    Verified Buyer
    5.0

    Batch order arrived on time.

Questions & Answers

  • What does the Cisco NIM-2FXS provide?

    NIM-2FXS delivers two FXS ports for analog phone, fax, and paging integration on ISR 4000 routers, ideal for micro-branches or specialized analog endpoints.

  • When to use NIM-2FXS vs NIM-2FXSP?

    Select 2FXS for standard analog power needs; pick 2FXSP if devices require stronger battery feed/ringing. Both support common voice features on IOS XE.

  • Is fax supported?

    Yes. T.38 or pass-through is supported. Test with your fax models and adjust ECM, jitter buffers, and packetization timers for best results.

  • How does NIM-2FXS work with SRST?

    Enable SRST for local dial tone during WAN outages. Analog users continue calling through FXO or cellular backup paths if configured.

  • Can I mix with digital or SIP trunks?

    Yes. ISR can terminate SIP on CUBE or digital WAN while still serving analog lines, enabling staged migration from legacy to VoIP.

  • Any QoS requirements?

    Prioritize voice traffic with LLQ and DSCP markings. Even analog endpoints ultimately traverse IP WAN, so QoS consistency matters.

  • How about security for signaling?

    Harden management, restrict access, and use secure CUCM communications. Limit administrative access and enable audit logs.

  • What’s the installation footprint?

    It occupies one NIM slot. Ensure your ISR model has available slots and sufficient power for all installed modules.

Warranty

100% Low Price Guarantee:

Layer23-switch.com provides high-quality products at low wholesale prices

100% Quality Assurance:

All items are ORIGINAL and GENUINE only.
Item conditions are "New Sealed" or "Used / Refurbished".
Used & refurbished items are fully tested with good conditions by Cisco-certified Engineers.

Free CCIE Technical Support:

Our FREE Cisco CCIE Expert Consultancy Support is over the phone, by chat, by email or by login remotely.

100% Money Back Guarantee:

You can contact our customer service team to exchange or return any product that you bought from us.

Standard Services

Personalized Service, Superior Product Maintenance for Ultimate Satisfaction.

  • Projects and Technical Support
  • Easy Purchasing Supply
  • Product Lifecycle Protection
  • Exclusive F3 Team Support

Customized Support for Your Needs with CCIE, HCIE, HPE ASE, etc.

Shipping

Resources Downloads

  • NIM-2FXS Datasheet

Product Tag

Related products

  • NIM-2FXSP

    NIM-2FXSP

    Original price was: $983.00.Current price is: $300.85. Condition: New Factory Sealed
  • NIM-2FXS/4FXONIM-2FXS/4FXO

    NIM-2FXS/4FXO

    Original price was: $983.00.Current price is: $488.85. Condition: New Factory Sealed
  • NIM-2FXONIM-2FXO

    NIM-2FXO

    Original price was: $983.00.Current price is: $195.23. Condition: New Factory Sealed
  • NIM-4FXSPNIM-4FXSP

    NIM-4FXSP

    Original price was: $983.00.Current price is: $400.85. Condition: New Factory Sealed