ISR 4400 Series is designed to deliver advanced services to the enterprise branches, they are ideal for mid-size to large branch environments, delivers unprecedented levels of WAN intelligence. Scalability, High-performance, Network Services, Security and Voice are only a few benefits of Cisco 4400 Series ISR. These platforms leverage separate dedicated control data and services CPUs for running multi-services with performance. Advanced network services enable the branch to utilize the WAN
| Aggregate throughput | 500 Mbps base, up to 1 Gbps with Performance license |
| Voice/UC features | SRST, CUBE, PVDM4 DSP support |
| Expansion | 3 x NIM, 1 x SM-X |
| WAN/LAN ports | 2 x 1GE (RJ-45/SFP combo) |
| Memory | 4 GB DRAM, 8 GB flash (default) |
| Power/Redundancy | AC PSU; optional dual PSUs |
| Service throughput | 500 Mbps default; 1 Gbps with Performance-on-Demand |
| Voice capabilities | SRST, CUBE, SIP/H.323; supports PVDM4 DSP modules |
| TDM/Analog voice | FXO/FXS and T1/E1 via NIM modules |
| Interface slots | 3 x NIM, 1 x SM-X |
| Built-in interfaces | 2 x 1GE (RJ-45/SFP combo), USB 2.0, RJ-45 and mini-USB console |
| DRAM | 4 GB (expandable to 16 GB) |
| Flash memory | 8 GB (expandable) |
| VPN capability | Hardware-accelerated IPsec; up to 2,000 tunnels |
| Power | Single AC standard; optional dual AC/DC |
| Form factor | 1RU, 19-inch rack mount |
Yes, the Cisco ISR4431-V/K9 Router is currently in stock and available for immediate shipment from our Boulder, CO warehouse. Same-day shipping on orders placed before 2pm MT.
This ISR4431-V/K9 is professionally refurbished or new-surplus enterprise hardware. Every unit is fully tested, factory-reset, and inspected before shipping. Cosmetic blemishes (rack marks, minor scuffs) may be present but never affect functionality.
The ISR4431-V/K9 comes with the Eldo Systems Lifetime Warranty covering hardware defects. We are an independent reseller — manufacturer warranties do not apply, but our lifetime coverage matches or exceeds typical OEM terms.
Free ground shipping on every order, included in the price. Orders ship same-day if placed before 2pm MT (Mon–Fri). Expedited overnight and 2-day options are available at checkout for urgent deployments.
Yes — we ship worldwide. International orders are quoted individually so we can present accurate freight, duties, and lead time. Use the Request a Quote form or call (484) 630-1533 to start.
Absolutely. We offer volume discounts and project pricing for resellers, integrators, and end-users buying in quantity. Submit a quote with your target quantity and our team will respond within 15 minutes during business hours.
Get the ISR4431-V/K9 from Eldo Systems with lifetime warranty and free ground shipping.
Independent Reseller Notice: Eldo Systems is an independent reseller of refurbished and new-surplus enterprise networking equipment. We are not affiliated with, authorized by, or endorsed by Cisco, Juniper, Arista, HPE, Dell, Meraki, Fortinet, Mellanox, NVIDIA, Finisar, or any other manufacturer listed on this site. All product names, logos, and brands are property of their respective owners. All products sold are refurbished or new-surplus unless otherwise noted. Manufacturer warranties do not apply; all items are covered by the Eldo Systems Lifetime Warranty.
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