NIM-2FXO – 2-Port FXO Voice – Analog NIM – Cisco 4000 ISR
13/mo Solds
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-2FXO Description
NIM-2FXO is a Cisco 4000 Series ISR analog voice Network Interface Module that adds two Foreign Exchange Office ports for connecting branch routers to analog PSTN lines, PBX trunks, key systems, or off-premises voice services. It is an FXO NIM for supported Cisco 4000 Series Integrated Services Router NIM slots, with Cisco documentation identifying the 2-port FXO universal ordering description, onboard DSP design for the voice NIM family, IOS XE release support from XE3.13.4 and later trains listed for this SKU, and managed OIR support when no active calls are present. For voice gateway BOMs, this module is used when the router needs legacy analog line termination rather than Ethernet, optical, or switching expansion.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
NIM-2FXO |
|
Product type |
2-port FXO Network Interface Module |
|
Cisco ordering description |
2-port Network Interface Module – FXO (Universal) |
|
Port count |
2 FXO voice ports |
|
Analog interface role |
Foreign Exchange Office line interface |
|
ISR G2 comparison |
VIC2-2FXO |
|
Supported router context |
Cisco 4000 Series ISR NIM slots; Cisco 4300 and 4400 Series support context |
|
Cisco IOS XE release for this SKU |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 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 |
|
Weight |
0.42 lb (191 g) |
Application Scenarios
Choose NIM-2FXO when a Cisco 4000 Series ISR voice gateway needs two analog FXO ports for PSTN handoff, PBX connection, key-system connection, or North America CAMA trunk service.
Select this module when the site is moving from the older VIC2-2FXO role to the fourth-generation Cisco NIM family and the design does not need four FXO ports or a mixed FXS/FXO card.
Keep NIM-2FXO in the bill only after the carrier or PBX handoff is known, because FXO configuration depends on loop-start or ground-start signaling, dialing method, locale tone plan, and disconnect behavior.
Product Comparison
|
Parameter |
NIM-2FXO | ||
|---|---|---|---|
|
Cisco ordering description |
2-port Network Interface Module – FXO (Universal) |
4-port Network Interface Module – FXO (Universal) |
2-Port FXS/FXS-E/DID and 4-Port FXO Network Interface Module |
|
Product type |
FXO analog voice Network Interface Module |
FXO analog voice Network Interface Module |
Combination FXS and FXO analog voice Network Interface Module |
|
Port count |
2 FXO ports |
4 FXO ports |
2 FXS/FXS-E/DID ports and 4 FXO ports |
|
Primary interface role |
Foreign Exchange Office line-side analog voice |
Foreign Exchange Office line-side analog voice |
Mixed FXS/FXS-E/DID and FXO analog voice |
|
ISR G2 comparison |
VIC2-2FXO |
VIC2-4FXO |
VIC2-4FXO and VIC3-2FXS/DID |
|
Cisco IOS XE release for this SKU |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 and above |
XE3.14.3, XE3.15.1, XE3.16 and above |
|
DSP note |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
Voice NIM includes onboard DSP |
|
Weight |
0.42 lb (191 g) |
0.44 lb (200 g) |
0.52 lb (236 g) |
|
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 |
- In a NIM-2FXO vs NIM-4FXO comparison, the confirmed difference is FXO port count: NIM-2FXO provides two FXO ports, while NIM-4FXO provides four FXO ports in the same analog voice NIM family.
- The NIM-2FXO difference from NIM-2FXS/4FXO is interface mix. NIM-2FXO is the two-port FXO-only module, while NIM-2FXS/4FXO combines two FXS/FXS-E/DID ports with four FXO ports.
- For buyers comparing NIM-2FXO vs NIM-4FXO or NIM-2FXS/4FXO, the model to choose depends on required FXO line count, whether FXS service is also required, and the Cisco IOS XE release row shown in the table.
Selection Guide
1. Choose it for two FXO analog lines
Select NIM-2FXO when the Cisco 4000 Series ISR bill calls for two FXO ports and no FXS or E/M analog interface on the same module.
2. Move to NIM-4FXO for four FXO trunks
Use NIM-4FXO instead when the design needs four FXO ports and the project does not require FXS or DID service on the same NIM.
3. Move to NIM-2FXS/4FXO for mixed analog voice
Choose NIM-2FXS/4FXO when the Cisco order must combine FXS or DID service with four FXO ports in one analog voice Network Interface Module.
4. Validate software and signaling before ordering
Confirm the IOS XE release row, Unified Communications technology package scope, loop-start or ground-start plan, DTMF or pulse dialing method, and locale tone setting before hardware is added to the quote.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact product ID |
NIM-2FXO |
Separates the 2-port FXO NIM from NIM-4FXO and the mixed NIM-2FXS/4FXO card |
|
Interface role |
Foreign Exchange Office service for PSTN, PBX, key-system, or CAMA trunk connection |
Keeps the order aligned with FXO line-side service rather than FXS station-side service |
|
Router slot plan |
Cisco 4000 Series ISR NIM placement or Cisco-documented NIM carrier-card placement |
Prevents assigning the analog voice NIM outside the platform context Cisco documents |
|
Software baseline |
Cisco IOS XE release row for NIM-2FXO and the Unified Communications technology package |
Matches Cisco voice-application requirements before activation |
|
Signaling setup |
Loop-start or ground-start signaling, DTMF or pulse dialing, and local call-progress tone locale |
Avoids installation rework when carrier or PBX signaling is already defined |
|
Cabling |
Straight-through 2-wire cable for NIM FXO and FXS port connections |
Follows Cisco cabling guidance for analog NIM port connection |
|
OIR timing |
No active calls before managed OIR work |
Cisco documents managed OIR restrictions for fourth-generation voice and fax NIMs |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | NIM-2FXO | Product type | FXO analog voice Network Interface Module |
| Cisco ordering description | 2-port Network Interface Module – FXO (Universal) | Port count | 2 FXO voice ports |
| Analog interface role | Foreign Exchange Office line interface | ISR G2 comparison | VIC2-2FXO |
| 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 | XE3.13.4, XE3.14.3, XE3.15.1, XE3.16 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 | Voice-port configuration form | voice-port slot/subunit/subslot |
| FXO signaling options | groundStart or loopStart | Dialing method options | DTMF, MF, or pulse |
| Call progress tone setting | cptone locale under voice-port configuration | Ring detection setting | ring number under FXO voice-port configuration |
| FXO connection role | PBX, key system, off-premises PSTN connection, or analog CAMA trunk service | FXO feature notes | Caller ID, battery reversal detection, cable detection, and overload protection |
| 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 | Managed OIR restriction | Managed OIR is not supported with active calls |
| Cabling note | Straight-through 2-wire cable for NIM FXO and FXS port connections | Network management | Remote and local configuration, monitoring, and troubleshooting from Cisco IOS XE Software CLI |
| Weight | 0.42 lb (191 g) | Official ordering description | 2-port Network Interface Module – FXO (Universal) |
Get More Information
Need pricing, stock, or shipping details for the NIM-2FXO ? Layer23-Switch can help you check current availability, lead time, and delivery options for this. Send us the part number, quantity, and destination country via live chat or email sales@layer23-switch.com for a fast quotation.
Quality Certifications
Customer Reviews
Questions & Answers
-
What does NIM-2FXO add to a Cisco ISR?
-
How is NIM-2FXO different from an FXS module?
-
Why do NIM-2FXO deployments mention dial tone detection?
-
Does NIM-2FXO need separate DSP resources?
-
Which routers are checked before ordering NIM-2FXO?
-
Can NIM-2FXO replace SIP trunks?
-
What symptom points to a NIM-2FXO recognition problem?
-
How many analog trunks does NIM-2FXO provide?
Warranty
Layer23-Switch.com offers genuine, high-quality ICT products at competitive wholesale prices—ensuring exceptional value without compromising quality.
All items are brand new, original, and factory-sealed.
Upon request, each unit can be fully tested and verified by a Cisco CCIE-certified engineer to ensure perfect working condition before shipment.
Our Cisco CCIE-certified experts provide free professional support via phone, email, online chat, or remote login—helping you deploy and troubleshoot with confidence.
If you are not satisfied with your purchase, you may request an exchange or full refund. Our customer service team will guide you through the return process quickly and smoothly. Visit Return Policy page for more information.
We support multiple secure payment and logistics options, backed by industry-leading verification:
Visit How to Pay page for more information
Extended, Worry-Free Warranty Coverage Factory New Sealed Enterprise Hardware:
· 3 Years Factory New Sealed
Visit Warranty Policy page for more information
Verify, plan, and comparewith confidence
Use practical tools to check device details, review lifecyclemilestones, and compare hardware before you buy.
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.
Up and running on the first attempt. That’s what we want from new hardware.
Got a quick response when I needed pricing confirmation for an internal approval.
We compared total landed cost across vendors. Layer23 came out ahead.
Perfectly organized delivery. Documentation was flawless.
Small part, but packed very well. Anti-static bag was sealed.