Cisco NIM-4FXSP 4-Port FXS Analog Voice Network Interface Module

Save significantly over new list price on this professionally refurbished Cisco NIM-4FXSP 4-port analog voice module — backed by Reef Telecom's industry-leading 10-year warranty. Ideal for connecting analog phones, fax machines, paging systems, and DID trunks to your Cisco ISR 4000 Series router.

Key Specifications

• Part Number: NIM-4FXSP
• Ports: 4x FXS/FXS-E/DID analog voice ports (RJ-11)
• Compatibility: Cisco ISR 4300 and 4400 Series routers, VG420 and VG450 Voice Gateways
• Onboard DSP: Dedicated digital signal processor — no PVDM required on the motherboard
• Echo Cancellation: Up to 128ms echo-tail length
• Codec Support: G.711, G.729a, G.729ab, G.723, iSAC, and more
• Voice Protocols: SCCP, SIP, H.323, MGCP 1.0
• UC Integration: Cisco Unified Communications Manager (CUCM), CME, SRST, and CUBE
• Hot-Swappable: Supports Online Insertion and Removal (OIR) for zero-downtime deployment
• Fax Support: T.38 fax relay and pass-through
• Software Requirement: Cisco IOS XE 16.5 or later

Common Use Cases

• Branch office analog phone and fax connectivity
• Warehouse phones, elevator lines, overhead paging, and door phones
• Legacy PBX-to-VoIP migration — preserve existing analog endpoints
• Direct Inward Dial (DID) trunk integration from PSTN
• Emergency and alarm line connectivity

Why Buy from Reef Telecom?

• 10-Year Warranty on all refurbished equipment
• Free Shipping on orders over $300
• Professionally tested and restored to full working condition
• Trusted B2B telecom equipment supplier

Note: The NIM-4FXSP is not compatible with Cisco 2900 or 3900 Series ISRs. Requires a NIM slot on a supported Cisco 4000 Series ISR or VG4xx Voice Gateway.

Free ground shipping on orders over $300. Same-day shipping on orders placed before 4PM EST.

All products include our industry-leading 10 Year Warranty backed by Reef Telecom.