• Cisco NIM-4FXO 4-port FXO voice module with green PCB and silver frame
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Cisco

Cisco NIM-4FXO | 4x FXO analog trunk | Voice NIM | PSTN/CO line connectivity

NIM-4FXO

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Description

Adds four FXO analog trunk ports for connecting ISR routers to the PSTN or PBX CO/trunk interfaces. Ideal for branch voice gateways, PSTN failover, and legacy interconnect.

Features

- Four FXO trunks for dense PSTN connectivity
- Straightforward PSTN or PBX CO line integration
- Ideal for voice gateway and survivability designs
- Proven analog interoperability in branch deployments
- Easy configuration within IOS XE voice features

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

- Ports: 4x FXO analog trunks
- Function: Connects to PSTN/central office or PBX trunk ports
- Use cases: Voice gateway, PSTN fallback, legacy PBX interop
- Module type: Network Interface Module (NIM)
- Router compatibility: ISR 4000 Series with NIM slots (e.g., 43xx/44xx)
- Signaling: Analog FXO trunk interface

FAQs

Q: What does an FXO port connect to?
A: It connects to the PSTN (central office) or to a PBX trunk (CO line) to receive dial tone.

Q: Can this be used for PSTN failover?
A: Yes. It is commonly used to provide PSTN backup for SIP or PRI services.

Q: Is caller ID supported?
A: Analog caller ID support depends on regional settings and IOS XE; consult platform release notes.

Q: Does the module power analog phones?
A: No. FXO is a trunk interface; it does not supply battery feed to endpoints.

Q: Which routers support it?
A: ISR 4000 routers with NIM slots; verify software version for specific features.

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