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NIM-4FXSP – 4 Port – Network Interface Module – FXS, FXS-E and DID
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NIM-4FXSP Description
Cisco NIM-4FXSP is a four-port Foreign Exchange Station (FXS) analog voice Network Interface Module designed for Cisco ISR 4000 Series routers. Each port can function either as a standard FXS line or as Direct Inward Dial (DID) for inbound-only PSTN calls, enabling versatile deployment in branch and enterprise networks. With integrated DSP resources, the module supports up to 128-ms echo cancellation, a broad set of codecs, and compatibility with fax and modem devices via T.38 relay and pass-through.As a “P” version, the NIM-4FXSP incorporates a new hardware component with no functional differences from non-P models. It supports online insertion and removal (OIR) for reduced downtime, works with IOS XE 16.5 or later, and interworks seamlessly with SCCP, H.323, SIP, and MGCP 1.0 Unified Communications protocols.
Key Features
Four FXS Ports with DID Option
Provides four analog station interfaces with DID capability, supporting analog phones, fax machines, key systems, and inbound PSTN lines.
Integrated DSP for Advanced Voice
Includes built-in DSP for TDM voice features, eliminating the need for router PVDMs and enabling echo cancellation up to 128 ms, VAD, and comfort noise generation.
Comprehensive Codec Portfolio
Supports G.711, G.729a, G.726, plus G.723 and iSAC for efficient bandwidth utilization and compatibility across enterprise WAN deployments.
Enterprise-Grade Telephony Features
Delivers caller-ID generation, battery polarity reversal, Message Waiting Indicator (MWI), cable detection, and long-loop support, enhancing analog line reliability.
Legacy Device and Fax/Modem Support
Compatible with T.38 fax relay, fax pass-through, and modem pass-through, ensuring reliable operation of legacy fax machines and dial-up devices.
Seamless UC Integration
Supports OIR on ISR 4300/4400 platforms, SNMP/MIB-based manageability, and interoperability with SCCP, H.323, SIP, and MGCP 1.0 under Cisco IOS XE.
Applications Scenarios
Branch offices and DID integration
Deploy analog phones, fax machines, or DID trunks in small branches while migrating to VoIP.
Hospitality and retail operations
Support guest-room telephony, POS modems, and fax lines with MWI and caller-ID functions.
Public sector and healthcare
Maintain compliant analog connectivity for fax, alarms, and regulated devices while enabling PSTN backup lines.
Product Comparison
|
Parameter |
NIM-4FXSP | ||
|---|---|---|---|
|
Port makeup |
2 × FXS (FXS/DID) |
4 × FXS (FXS/DID) |
2 × FXS (FXS/DID) + 4 × FXO |
|
“P” version note |
New hardware, no functional change |
Same |
Same |
|
DID capability |
Yes (inbound only) |
Yes (inbound only) |
Yes (FXS only) |
|
MWI / long-loop / cable detect |
Supported |
Supported |
Supported |
|
Caller-ID generation & polarity |
Yes |
Yes |
Yes (FXS generate; FXO detect) |
|
Onboard 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 |
Same |
Same |
|
OIR support |
Yes |
Yes |
Yes |
|
Minimum IOS XE |
16.5+ |
16.5+ |
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-4FXSP (4-port FXS with Power Network Interface Module) | Form factor | NIM plug-in module for Cisco ISR 4000 Series Routers |
| Ports | 4 × FXS, RJ-11 connectors with integrated power feed | Interface type | Foreign Exchange Station (FXS) with internal battery and ring generator |
| Platform support | Cisco ISR 4321, 4331, 4351, 4431, 4451 | Online Insertion/Removal (OIR) | Supported |
| Typical devices connected | Analog telephones, fax machines, analog modems, key systems | Loop current | 20–30 mA nominal (powered FXS interface) |
| Ring voltage | Up to 75 Vrms, 20–25 Hz | REN capacity | Up to 5 REN per port |
| Signaling | Loop start, Ground start | Caller ID | Supported (Type I/II, Bellcore and ETSI formats) |
| 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 | Up to 128 ms tail length | Voice optimizations | VAD, CNG, cRTP (Compressed RTP) |
| DSP resources | On-module DSP (no chassis PVDM required) | Country configuration | Software-selectable (global homologation) |
| Cabling | 2-wire analog, straight-through RJ-11 | Use cases | Analog voice, fax, or powered analog phone connectivity in branch gateways |
| Minimum software | Cisco IOS XE 3.13 or later (Unified Communications feature set) | 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. 0.47 lb (≈213 g) |
| Power consumption | Up to 18 W (due to built-in ring generator and power feed) | Operating temperature | 0°C to 40°C (32°F to 104°F) |
| Ordering PID | NIM-4FXSP | Warranty | Per Cisco standard hardware warranty policy |
Get More Information
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Quality Certifications
Customer Reviews
Questions & Answers
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What is the Cisco NIM-4FXSP used for in ISR4000 routers?
-
How does NIM-4FXSP differ from NIM-4FXS?
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Can NIM-4FXSP coexist with FXO modules in one ISR?
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Does NIM-4FXSP support MGCP and SIP?
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What are common use cases for NIM-4FXSP?
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How does it help during power loss events?
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Is caller ID and impedance configurable on NIM-4FXSP?
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What licensing is typically required?
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