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Voice and security workloads handled smoothly. Stable enterprise performance.
ISR4431-VSEC/K9
Cisco ISR 4431 Bundle with UC & Sec Lic. PVDM4-64. CUBE-25
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ISR4431-VSEC/K9
Cisco ISR 4431 Bundle with UC & Sec Lic. PVDM4-64. CUBE-25
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ISR4431-VSEC/K9 is a modular and high-performance enterprise router engineered for branch offices, featuring a robust architecture with integrated security enhancements and redundant AC power supply options. It supports flexible WAN and LAN interfaces through integrated and expansion modules that enable diverse connectivity and optimized data traffic management.
ISR4431-VSEC/K9 delivers comprehensive integrated services including voice, video, and WAN optimization while offering advanced VPN capabilities such as IPSec, SSL VPN, GRE, DMVPN, and FlexVPN. With a throughput capacity of up to 1 Gbps, built-in firewall and intrusion prevention features, and a design centered on redundancy and scalability, this router is ideally suited for enterprise use cases requiring secure, high-performance network connectivity.
ISR4431-VSEC/K9 price is $12,138.00, a 55.3% saving from the Cisco list price of $27,137.00. ISR4431-VSEC/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for ISR4431-VSEC/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
A multinational retail chain deploys the Cisco ISR 4431 Bundle with UC & Sec Lic, PVDM4-64 and CUBE-25 at 200+ branch stores to establish encrypted MPLS and DMVPN tunnels. By integrating advanced firewall, intrusion prevention and site-to-site VPN on a single platform, the solution delivers PCI-DSS compliant checkout, real-time inventory synchronization and unified VoIP across all locations—reducing security incidents by 70% and cutting WAN management costs by 30%.
A 500-agent financial services contact center leverages the Cisco ISR 4431 Bundle with UC & Sec Lic, PVDM4-64 and CUBE-25 to consolidate legacy PRI trunks into a redundant SIP trunk architecture. CUBE-25 provides protocol normalization, direct PSTN routing and centralized session control, ensuring 99.99% call uptime, 4:1 trunk utilization improvements and a 25% reduction in monthly carrier fees—all while maintaining PCI and FINRA compliance.
A global professional services firm implements the Cisco ISR 4431-VSEC/K9 with UC & Sec Lic, PVDM4-64 and CUBE-25 to seamlessly transition 1,200 users from legacy PBX to a hybrid cloud UC platform. The integrated media modules and voice licensing accelerate SIP registration, call routing and high-definition media transcoding, yielding a 40% faster deployment, a 50% reduction in on-premises hardware footprint and a 20% uplift in voice quality (MOS >4.1).
To get the detailed certification, please go to the Compliance Center.
 ISR4431-VSEC/K9 |  C1-CISCO4351/K9 |  C1-CISCO4221/K9 |  ISR4451-X-VSEC/K9 |  ISR4461-AXV/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Modular | Fixed | Modular | Modular |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
| Compliance Standards | FCC, CE, UL | FCC / CE / UL | FCC, CE, UL | FCC / CE / UL | FCC / CE / UL |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | N/A | 11.5 inches | 10.1 inches | 18.03 inches | N/A |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC, CE | N/A | FCC, CE | N/A | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | NIM | EHWIC | EHWIC | NIM / EHWIC | EHWIC / NIM |
| Features | VPN / Firewall / IPS / Intrusion Prevention / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / Firewall / IPv6 Compatible / QoS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 2 GB | 2 GB | 256 MB | 1 GB | 1 GB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | N/A | 1.73 inches | 1.73 inches | 2.91 inches | N/A |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice / Video / WAN Optimization | Voice / Video | Voice, Video, WAN Optimization, Security | Voice / Video / WAN Optimization |
| Interface Ports | RJ-45 / SFP / Combo Ports | RJ-45 / Combo Ports | RJ-45 | RJ-45, SFP | RJ-45 / SFP / Combo Ports |
| LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 4 GB | 4 GB | 2 GB | 8 GB | 4 GB |
| Modular Slots Available | 3+ Slots | 2 Slots | 2 Slots | 2 Slots | 3+ Slots |
| Network Protocols | IPv4, IPv6, MPLS | IPv4 / IPv6 | IPv4, IPv6, MPLS | IPv4, IPv6 | IPv4 / IPv6 |
| Power | 350 W | 65 Watt | 80 Watt | 335 W | 370W |
| Power Source | AC Power Supply / Redundant | AC Power Supply / Redundant | AC Power Supply / N/A | AC Power Supply / DC Power Supply / Redundant | AC Power Supply / Redundant |
| Product Name | Cisco ISR4431-VSEC/K9 | C1-CISCO4351/K9 | Cisco 4221 Integrated Services Router | Cisco ISR4451-X-VSEC/K9 | Cisco ISR 4461 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP, NetConf | SNMP / CLI / NETCONF | CLI, WebUI, SNMP | Cisco IOS XE CLI / Web GUI | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing / N/A | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing |
| Safety | UL Listed | N/A | UL, CE | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | Yes | No | No | Yes | Yes |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 1 Gbps | 400 Mbps | 0.075 Gbps | 2 Gbps | 1 Gbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise | Enterprise |
| VPN Support | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A | IPSec / DMVPN / FlexVPN | IPSec / DMVPN / FlexVPN / N/A | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | Modular WAN | 2 WAN | 2 WAN | 4 WAN | 2 WAN |
| Weight | N/A | 14 lbs | 15.7 lbs | 29.76 lbs | N/A |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | 17.5 inches | 17.3 inches | 17.32 inches | N/A |
| Wireless Support | No | No | No | No | No |
Voice and security workloads handled smoothly. Stable enterprise performance.
Good balance of throughput and UC features. Easy to manage.
Cisco reliability with consistent call quality.
Strong VSEC performance for branch deployments.
Dependable ISR for secure voice environments.
The ISR4431-VSEC/K9 bundle combines a Cisco ISR 4431 router with Unified Communications (UC) and Security (SEC) licenses, PVDM4-64 DSP module for voice, and CUBE-25 session license for secure voice and video connectivity.
The Cisco ISR 4431 supports up to 1 Gbps of aggregate throughput and offers embedded hardware acceleration for routing, encryption and QoS to ensure low latency and high reliability in enterprise branch deployments.
The PVDM4-64 DSP module provides up to 64 digital signal processor channels for concurrent voice transcoding, conferencing and media termination across SIP and H.323 sessions.
The UC & Sec license includes advanced firewall, IPS, URL filtering, VPN (DMVPN, FlexVPN), Cisco TrustSec, Secure Boot and Cisco Umbrella integration for comprehensive branch security.