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ISR4321-V/K9
Cisco ISR 4321 Bundle, w/UC License
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ISR4321-V/K9 is a fixed enterprise router engineered for high-performance branch connectivity, featuring a robust architecture with integrated services such as voice and video, versatile power options through an AC power supply with redundancy, and clearly defined WAN/LAN interfaces including two WAN ports and four LAN ports. Its design emphasizes modular capabilities with two expansion slots that support additional EHWIC modules, ensuring scalability and adaptability for varied network demands.
ISR4321-V/K9 delivers advanced VPN support including IPSec, SSL VPN, DMVPN, and FlexVPN, while achieving a throughput capacity of up to 300 Mbps to meet demanding enterprise applications. Coupled with built-in security features like firewall and intrusion prevention, high availability, and efficient remote management via SSH, Telnet, and SNMP, this router is optimized for enterprise use cases where reliability, performance, and integrated services are critical.
ISR4321-V/K9 price is $1,966.00, a 58% saving from the Cisco list price of $4,676.00. ISR4321-V/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4321-V/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
In a national retail chain scenario, the Cisco ISR4321-V/K9 bundle with UC License creates encrypted IPsec VPN tunnels across 50+ stores and delivers carrier-grade voice and data over a single device. Leveraging Cisco Unified Communications Manager Express and built-in voice gateways, this solution cuts operational complexity by 40%, enforces end-to-end QoS for VoIP, and centralizes network and telephony management—ensuring consistent, high-quality communications in every location.
Professional services firms deploy the Cisco ISR4321-V/K9 with UC License as an application-aware on-ramp to SaaS UC platforms like Webex, Microsoft Teams and Office 365. By combining SD-WAN connectivity, granular QoS and secure voice gateways, the router delivers 99.9% uptime, reduces jitter by up to 60%, and accelerates video conferencing. The outcome: a highly responsive, reliable collaboration environment that boosts productivity and meets stringent SLAs.
A distributed financial advisory firm uses the Cisco ISR4321-V/K9 bundle with UC License to enforce encrypted SIP/H.323 voice and video calls, integrate Cisco Unified Border Element, and apply advanced firewall segmentation. This deployment achieves PCI and Dodd-Frank compliance, cuts deployment time by 50% through reusable templates, and delivers a trusted, auditable communications backbone—ensuring secure, high-quality client interactions under strict regulatory mandates.
To get the detailed certification, please go to the Compliance Center.
 ISR4321-V/K9 |  ISR4451-X-AX/K9 |  ISR4461-AXV/K9 |  ISR4321-AXV/K9 |  ISR4221-SEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Modular | Modular | Fixed | Fixed |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention |
| Compliance Standards | FCC, CE | FCC / CE | FCC / CE / UL | FCC, CE | IEEE 802.3, FCC, CE |
| Connectivity Type | Wired / Ethernet | Wired | Wired | Wired | Wired |
| Depth | 16.1 inches | 16.90 inches | N/A | 18.3 inches | 11.3 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | FCC / CE | N/A | CISPR22, FCC Part 15 | CISPR 22 |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | EHWIC | EHWIC / NIM | EHWIC / NIM | NIM / EHWIC | EHWIC |
| Features | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / VoIP / IPv6 Compatible / Firewall / MPLS / Syslog | VPN / Firewall / IPv6 Compatible / QoS | Mesh / VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / IPv6 Compatible / Firewall |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 512 MB | 1 GB | 256 MB | 1 GB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount / Desktop | Desktop |
| Height | 1.75 inches | 1.75 inches | N/A | 1.75 inches | 1.73 inches |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video | Voice / Video | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video |
| Interface Ports | RJ-45 | RJ-45 / SFP | RJ-45 / SFP / Combo Ports | RJ-45 / SFP | RJ-45 |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 2 GB | 4 GB | 4 GB | 512 MB | 1 GB |
| Modular Slots Available | 2 Slots | 3 Slots | 3+ Slots | 2 Slots | 1 Slot |
| Network Protocols | IPv4, IPv6 | IPv4 / IPv6 / MPLS | IPv4 / IPv6 | IPv4, IPv6 | IPv4, IPv6 |
| Power | 65W | 350W | 370W | 54 W | 65W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / Redundant |
| Product Name | Cisco ISR4321 Integrated Services Router | Cisco ISR4451-X-AX/K9 | Cisco ISR 4461 Integrated Services Router | Cisco ISR4321-AXV/K9 | Cisco ISR 4221-SEC/K9 |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | Cisco IOS XE CLI / SNMP / NetConf | SSH / Telnet / SNMP | SSH, Telnet, SNMP | SSH, Telnet, SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing / MPLS |
| Safety | N/A | UL / CSA | N/A | RoHS Compliant | UL, cUL |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | No | Yes | Yes | No |
| Telecom | N/A | N/A | N/A | TIA/EIA | FCC Part 15 |
| Throughput Capacity | 300 Mbps | 2 Gbps | 1 Gbps | 200 Mbps | 300 Mbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise / Branch | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | 12.3 lbs | 17.6 lbs | N/A | 13.2 lbs | 8.6 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.3 inches | 17.32 inches | N/A | 17.5 inches | 17.2 inches |
| Wireless Support | No | No | No | No | No |
Solid UC performance for branch offices. Voice quality is clear and the router has been stable since deployment.
Reliable ISR for voice workloads. Easy to configure and performs well in daily business operations.
Good choice for smaller branches needing Cisco voice services. Consistent uptime and predictable behavior.
Cisco reliability with integrated UC licensing. No call drops or performance issues so far.
Straightforward deployment and dependable voice handling. Meets expectations for a branch router.
The Cisco ISR 4321 Bundle w/ UC License is an integrated services router with built-in unified communications features for small to medium offices, delivering routing, security, voice, and video in a single platform.
The ISR4321-V/K9 delivers up to 50 Mbps throughput, supports 50 VPN tunnels, and can handle 24,000 concurrent sessions, ensuring reliable performance for cloud and voice workloads.
The UC License provides bundled Cisco Unified Communications Manager Express (CME), voicemail, auto-attendant, SIP trunking, and up to four digital voice lines for integrated telephony.
With its UC License, the ISR 4321 supports up to 50 voice endpoints and 100 total users, making it ideal for small to medium-sized deployments.