Cisco ISR4321-V/K9 Voice Router — Enterprise-Grade Unified Communications at a Fraction of the Cost

Save up to 80% over list price on the Cisco 4321 Voice ISR without sacrificing performance or reliability. This refurbished ISR4321-V/K9 delivers advanced VoIP, routing, security, and WAN optimization in a single 1U chassis — ideal for branch offices and SMB deployments. Backed by Reef Telecom's industry-leading 10-year warranty.

Key Specifications

• Part Number: ISR4321-V/K9
• Throughput: 50 Mbps default, upgradeable to 100 Mbps
• WAN/LAN Ports: 2x onboard Gigabit Ethernet (10/100/1000Base-T) + 1x SFP
• Expansion: 2x NIM slots, 1x ISC slot
• Memory: 4 GB DRAM (expandable to 8 GB) / 4 GB Flash
• Voice: UC License with CUBE-10, PVDM4 DSP support for voice & video
• Security: IPsec, SSL VPN, FlexVPN, Zone-Based Firewall
• Management: Cisco IOS XE, SD-WAN ready, Cisco DNA Center compatible
• Form Factor: 1U rack-mountable / wall-mountable
• Power: 100–240 VAC auto-ranging, 125W max

Why Buy From Reef Telecom?

• ✅ 10-Year Warranty — the longest in the refurbished telecom industry
• ✅ Free Shipping on orders over $300
• ✅ Professionally tested and certified to OEM specifications
• ✅ Same-day shipping on in-stock items

Ideal Use Cases

The Cisco 4321 Voice ISR is designed for small to medium enterprise branch offices that need unified communications, secure VPN connectivity, and application-aware routing. Deploy as an SD-WAN edge router, VoIP gateway with CUBE, or converged branch platform supporting voice, video, and data on a single device.

Condition

Certified Refurbished

Warranty

10-Year Reef Telecom Warranty

Manufacturer Part Number

ISR4321-V/K9

Reef SKU

ISR4321-V/K9-R

UPC

882658710537

Brand

Cisco

Free ground shipping on orders over $300 (contiguous US). Same-day dispatch on orders placed before 4 PM EST.

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