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