• Cisco NIM-4FXS 4-port FXS voice module with green circuit board
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Cisco

Cisco NIM-4FXS | 4-port FXS/FXS-E/DID voice NIM, RJ-11, T.38 fax relay, requires router DSP (PVDM)

NIM-4FXS

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Description

4-port analog voice interface for connecting legacy phones, fax machines, and analog trunks (FXS/FXS-E/DID) to ISR routers. Ideal for branch voice gateway, SRST, and UC deployments with support for caller ID and fax relay.

Features

- Consolidates analog voice connectivity on ISR platforms
- Supports FXS, FXS-E, and DID signaling on all four ports
- T.38 fax relay for reliable fax over IP
- Flexible deployment for SRST, CUBE gateway, or PBX interop
- Field-proven analog integration for branch sites

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

- Form factor: Network Interface Module (NIM)
- Interfaces: 4x FXS/FXS-E/DID (RJ-11)
- Applications: Analog phones, fax machines, modems, PBX tie lines
- Voice features: Caller ID (FSK), polarity reversal, battery feed, ringing
- Fax: T.38 fax relay and passthrough (IOS-dependent)
- DSP resources: Requires router-based DSPs (e.g., PVDM) for voice services
- Compliance: FXS/FXS-E signaling; DID support for inbound trunks
- Compatibility: ISR 4000 routers with NIM slots (IOS-XE feature set dependent)

FAQs

Q: Which routers support this NIM?
A: ISR 4000 series routers with available NIM slots; check your IOS-XE version for voice feature support.

Q: Do I need additional hardware for voice processing?
A: Yes, DSP resources on the host router (e.g., PVDM4) are required for voice, conferencing, and transcoding features.

Q: Does it support fax?
A: Yes, T.38 fax relay and passthrough are supported when enabled in IOS and with adequate DSP resources.

Q: Is a special license required?
A: Some UC/gateway features may require appropriate IOS-XE voice licenses on the host router.

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