NIM-2FXSP – 2-Port FXS Voice – P-Version Analog NIM – Cisco ISR
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NIM-2FXSP Description
NIM-2FXSP is a Cisco two-port FXS analog voice Network Interface Module for Cisco 4000 Series ISR NIM slots, built for router-based station-side analog voice service and DID-capable incoming-call connections. The module provides two FXS/FXS-E/DID-capable voice ports, uses the Cisco ordering description “2-Port Network Interface Module - FXS, FXS-E and DID,” is documented for Cisco IOS XE 16.5 and above, and belongs to the analog voice NIM family with onboard DSP support so supported ISR deployments do not require a dedicated motherboard PVDM for this module family. It fits Cisco 4300 and 4400 Series ISR voice-interface deployments where the BOM needs a precise two-port analog voice NIM rather than a standalone router, switch, or generic voice accessory.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
NIM-2FXSP |
|
Product type |
2-port FXS analog voice Network Interface Module |
|
Cisco ordering description |
2-Port Network Interface Module – FXS, FXS-E and DID |
|
Port count |
2 FXS/FXS-E/DID-capable voice ports |
|
P-version note |
New manufacturing component version; no functionality change from the non-P version |
|
Analog interface role |
Station-side FXS service or DID incoming-call service |
|
ISR G2 comparison |
VIC3-2FXS/DID |
|
Supported router context |
Cisco 4000 Series ISR NIM slots; Cisco 4300 and 4400 Series support context |
|
Cisco IOS XE release for this SKU |
XE16.5 and above |
|
Voice package requirement |
Minimum Unified Communications technology package for voice applications |
|
DSP design |
Onboard DSP on the voice NIM; no dedicated motherboard PVDM required for this voice module family |
|
OIR support |
Supported in Cisco 4000 Series ISR NIM slots; managed OIR requires no active calls |
Application Scenarios
Specify NIM-2FXSP when a Cisco 4000 Series ISR voice gateway needs two FXS-class ports for analog phones, fax devices, key systems, or DID-mode handoff.
Keep NIM-2FXSP on the bill when procurement calls for the P-version product ID and the router software plan can meet the IOS XE 16.5-and-above row.
Use this module for a compact FXS or DID refresh where a four-port NIM-4FXSP card or a mixed FXS/FXO NIM would add ports that are not part of the site design.
Product Comparison
|
Parameter |
NIM-2FXSP |
NIM-2FXS/4FXOP | ||
|---|---|---|---|---|
|
Cisco ordering description |
2-Port Network Interface Module – FXS, FXS-E and DID |
2-Port Network Interface Module – FXS, FXS-E and DID |
4-Port Network Interface Module – FXS, FXS-E and DID |
2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module |
|
Product type |
FXS analog voice Network Interface Module |
FXS analog voice Network Interface Module |
FXS analog voice Network Interface Module |
Combination FXS and FXO analog voice Network Interface Module |
|
P-version status |
P version with no functionality change from non-P version |
Non-P version |
P version with no functionality change from non-P version |
P version with no functionality change from non-P version |
|
Port count |
2 FXS/FXS-E/DID-capable ports |
2 FXS/FXS-E/DID-capable ports |
4 FXS/FXS-E/DID-capable ports |
2 FXS/FXS-E/DID-capable ports and 4 FXO ports |
|
Primary interface role |
Station-side FXS service or DID incoming-call service |
Station-side FXS service or DID incoming-call service |
Station-side FXS service or DID incoming-call service |
Mixed station-side FXS/DID and line-side FXO analog voice |
|
ISR G2 comparison |
VIC3-2FXS/DID |
VIC3-2FXS/DID |
VIC3-4FXS/DID |
VIC2-4FXO and VIC3-2FXS/DID |
|
Cisco IOS XE release for this SKU |
XE16.5 and above |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
XE16.5 and above |
XE16.5 and above |
|
DSP note |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
|
OIR or hot-swap support |
Supported in Cisco 4000 Series ISR NIM slots |
Supported in Cisco 4000 Series ISR NIM slots |
Supported in Cisco 4000 Series ISR NIM slots |
Supported in Cisco 4000 Series ISR NIM slots |
- In a NIM-2FXSP vs NIM-2FXS comparison, both rows carry the same two-port FXS/FXS-E/DID role, but NIM-2FXSP is the P-version product ID and uses the XE16.5-and-above release row.
- The NIM-2FXSP vs NIM-4FXSP difference is FXS density: NIM-2FXSP provides two FXS-class ports, while NIM-4FXSP provides four.
- For a NIM-2FXSP vs NIM-2FXS/4FXOP comparison, the interface mix is the key difference because NIM-2FXS/4FXOP adds four FXO ports to the two FXS-class positions.
- Which model to choose depends on whether the bill requires the exact P-version two-port FXS PID, a non-P two-port PID, four FXS positions, or mixed FXS plus FXO connectivity.
Selection Guide
1. Match it to two FXS-class ports
Choose NIM-2FXSP when the Cisco 4000 Series ISR design needs two FXS/FXS-E/DID-capable ports and does not require FXO trunks on the same card.
2. Preserve the P suffix when the BOM requires it
Select the exact NIM-2FXSP line when procurement specifies the P-version PID; Cisco states that the P version does not change functionality from the non-P version.
3. Move up only for higher FXS density
Use NIM-4FXSP instead when the site needs four FXS-class ports and the rest of the platform and software assumptions remain in the same analog voice NIM family.
4. Separate FXS-only from mixed analog voice
Choose NIM-2FXS/4FXOP only when the bill needs four FXO ports in addition to the two FXS/FXS-E/DID-capable positions.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact product ID |
NIM-2FXSP |
Separates the P-version two-port FXS NIM from NIM-2FXS and the four-port or mixed-port variants |
|
P-version handling |
Cisco states no functionality change from the non-P version |
Prevents a functional redesign when the change is a documented manufacturing-component version |
|
Interface role |
FXS station-side service or DID incoming-call service |
Avoids ordering an FXS-class module for an FXO trunk requirement |
|
Router platform |
Cisco 4000 Series ISR NIM placement within Cisco 4300 or 4400 Series support context |
Keeps the module inside the Cisco-documented ISR analog voice scope |
|
Software baseline |
XE16.5 and above for NIM-2FXSP |
Avoids applying the earlier non-P NIM-2FXS release row to the P-version SKU |
|
Voice package and signaling |
Unified Communications package plus FXS or DID signaling plan |
Aligns the module order with Cisco voice application requirements and port configuration |
|
Cabling and OIR timing |
Straight-through 2-wire cabling and no active calls before managed OIR |
Follows Cisco cabling guidance and managed OIR restrictions for voice NIM work |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | NIM-2FXSP | Product type | FXS analog voice Network Interface Module |
| Cisco ordering description | 2-Port Network Interface Module – FXS, FXS-E and DID | Port count | 2 FXS/FXS-E/DID-capable voice ports |
| P-version note | Created due to a new hardware component in manufacturing | Functional relationship | No functionality change from the non-P version |
| Analog interface role | Station-side FXS service or DID incoming-call service | ISR G2 comparison | VIC3-2FXS/DID |
| Supported router family | Cisco 4000 Series Integrated Services Routers | Documented ISR series context | Cisco 4300 and 4400 Series ISRs |
| Unsupported ISR family | Not supported with Cisco 2900 and 3900 Series ISRs | Cisco IOS XE release for this SKU | XE16.5 and above |
| Voice package requirement | Minimum Unified Communications technology package for voice applications | DSP design | Onboard DSP on the voice NIM family |
| Motherboard PVDM requirement | No dedicated packet voice DSP module required on the router motherboard for this voice NIM family | FXS endpoint connection role | Direct connection to phones, fax machines, and key systems |
| DID connection role | Off-premises DID connection from the central office for incoming PSTN calls | DID caller ID note | DID mode does not support caller ID |
| FXS feature notes | FXS or DID functionality, configurable long loop ports, message waiting indicator, and cable detection | FXS signaling options | did delay-dial, did immediate, did loopStart, groundStart, or loopStart |
| Ring frequency options | 20, 25, 30, or 50 Hz | Call progress tone setting | cptone locale under voice-port configuration |
| Voice-port configuration form | voice-port slot/subunit/subslot | Managed OIR restriction | Managed OIR is not supported with active calls |
| OIR support | FXS, FXO, E/M, and BRI NIMs can be inserted into supported Cisco 4000 Series ISR NIM slots without powering off the router | Cabling note | Straight-through 2-wire cable for NIM FXS and FXO port connections |
| Analog NIM jumper note | No jumpers to set on NIM analog modules | Network management | Remote and local configuration, monitoring, and troubleshooting from Cisco IOS XE Software CLI |
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Customer Reviews
Questions & Answers
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What does NIM-2FXSP provide?
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How is NIM-2FXSP different from NIM-2FXS?
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When is NIM-2FXSP selected?
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Does NIM-2FXSP need external DSP resources?
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What cabling detail matters for NIM-2FXSP?
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Why does NIM-2FXSP have no dial tone?
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Can NIM-2FXSP terminate carrier trunks?
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Which NIM-2FXSP order details matter most?
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