'1U RACK-MOUNT'}
Cisco
Cisco ISR4431-V/K9 Refurbished - 4GE VoIP Router
MPN: ISR4431-V/K9
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Lifetime
Warranty
ISO 9001
Certified Testing
R2v3
Responsible Refurb
25+
Years
5K+
Customers
ISO
Certified
✓
Tested
Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.
Tested to factory specification. Backed by 25 years of enterprise trust.
The Cisco ISR 4431 (ISR4431-V/K9) is a powerful branch-office router from Cisco's Integrated Services Router 4000 Series, purpose-built to consolidate WAN, security, application optimization, and unified communications onto a single platform. This Refurbished unit delivers enterprise performance at a fraction of new-unit pricing, making it an ideal solution for cost-conscious IT procurement.Equipped with 4 onboard Gigabit Ethernet ports, the ISR 4431 handles diverse LAN and WAN connectivity requirements with ease. Three Network Interface Module (NIM) slots provide flexible expansion for additional WAN links, serial interfaces, cellular connectivity, or DSP modules to support voice workloads. The "-V" designation in the part number indicates integrated VoIP capability, enabling unified communications and telephony services directly from the router.
With 8GB of Flash storage and 4GB of DRAM, this router comfortably runs Cisco IOS XE software along with multiple concurrent services including security, QoS, and voice without performance degradation. The ISR 4431 supports throughput performance suitable for demanding branch environments and integrates cleanly with Cisco DNA Center for centralized management and automation.
Each Refurbished Cisco ISR4431-V/K9 from WhaleyComm undergoes inspection to ensure it is fully operational and ready for deployment. This is a smart, budget-friendly choice for enterprises looking to extend their Cisco infrastructure investment.
Technical Specifications
{'Model Number'
'ISR4431-V/K9', 'Brand': 'Cisco', 'Series': 'Integrated Services Router 4000', 'Condition': 'Refurbished', 'Onboard GE Ports': '4', 'NIM Slots': '3', 'Flash Storage': '8 GB', 'DRAM': '4 GB', 'VoIP Support': 'Yes', 'Operating System': 'Cisco IOS XE', 'Form Factor': '1U Rack-Mount'}
Ideal Use Cases
Branch Office WAN Aggregation
The ISR 4431 consolidates multiple WAN connections into a single managed platform, ideal for mid-size branch offices requiring reliable, high-availability connectivity. Its NIM slot expansion supports diverse link types including broadband, MPLS, and 4G LTE.
Unified Communications & VoIP Deployments
The "-V/K9" designation makes this router a natural fit for enterprises running on-premises voice and unified communications systems. DSP module support via NIM slots enables direct call processing, voice gateway, and PSTN integration at the branch level.
Network Refresh & Infrastructure Expansion
Organizations looking to expand or refresh their Cisco routing infrastructure on a controlled budget will find Refurbished ISR 4431 units an excellent value. The platform's compatibility with Cisco IOS XE and DNA Center ensures it integrates seamlessly into modern managed network environments.
What's Included
✔ Cisco ISR4431-V/K9 Refurbished Router Unit
✔ Power Supply (as equipped)
✔ Rack-Mount Hardware (if available)
✔ Basic Unit Inspection Completed
Lifetime Warranty - No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. 25 years, 5,000+ customers.
Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
✓
The Cisco ISR4431-V/K9 runs Cisco IOS XE Software and is compatible with the broader Cisco ISR 4000 Series ecosystem. It supports Network Interface Modules (NIMs) and SM-X service modules for expanded connectivity options. The platform integrates with Cisco DNA Center for intent-based networking and centralized policy management. It is also compatible with Cisco Smart Licensing and supports integration into existing Cisco enterprise network architectures including SD-WAN deployments when appropriately licensed. Compatible NIM modules include options for serial WAN, DSP voice processing, SSD storage, and wireless interfaces.
Shipping & Returns
Clear fulfilment, tracking, return, warranty, and support information for enterprise hardware orders.
Shipping
Orders ship within 1-2 business days.
Returns
Contact support for DOA or warranty issues.
Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
The "-V" designation indicates that this model includes Voice capabilities, meaning it is configured to support VoIP, DSP resources, and unified communications services natively within the router platform.
The "/K9" suffix is Cisco's standard designation indicating that the unit includes strong cryptographic (encryption) capabilities, enabling IPsec VPN and other security features that require export-controlled encryption licenses.
Yes, this is a Refurbished Cisco ISR4431-V/K9. Refurbished units have been previously deployed and returned, then inspected for operational integrity. They offer full router functionality at a reduced cost compared to new units, making them ideal for budget-conscious enterprise deployments.
Yes, the ISR 4431 supports Cisco IOS XE feature licensing for capabilities such as Security, UC, and AppX. Additional NIM modules can also be installed in the three available slots to expand WAN or voice interfaces based on your network requirements.
Cisco ISR4431-V/K9 Refurbished - 4GE VoIP Router
$229.00
