ISR4331-SEC/K9
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Cisco ISR4331-VSEC/K9 Integrated Services Router

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Cisco 4331 Integrated Services Router delivers 100 Mbps to 300 Mbps aggregate throughput and offers one Enhanced service-module (SM-X) slot, which supports for both single- and double-wide service modules provides flexibility in deployment options.

ISR4331-VSEC/K9 is the Cisco ISR 4331 router bundled with UC & Sec Lic.

PVDM4-32 and CUBE-10.

Quick Specs

Product Code

ISR4331-VSEC/K9
Aggregate Throughput 100 Mbps to 300 Mbps
Total onboard WAN or LAN 10/100/1000 ports 3
RJ-45-based ports 2
SFP-based ports 2
Enhanced service-module (SM-X) slot 1
NIM (Network Interface Modules) slots 2
Onboard ISC slot 1
Memory 4 GB (default) / 16 GB (maximum)
Flash Memory 4 GB (default) / 16 GB (maximum)
Power-supply options Internal: AC and PoE
Rack height 1 RU
Dimensions (H x W x D) 44.45 x 438.15 x 438.15 mm
Package Weight 12.96 Kg
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Description Cisco ISR 4331 Bundle with UC & Sec Lic. PVDM4-32. CUBE-10s Aggregate Throughput 100 Mbps to 300 Mbps Total onboard WAN or LAN 10/100/1000 ports 3 RJ-45-based ports 2 SFP-based ports 2 Enhanced service-module slots 1 Doublewide service-module slots 0 NIM slots 2 OIR (all I/O modules) Yes Onboard ISC slot 1 Default memory double-data-rate 3 (DDR3) error-correction-code (ECC) DRAM (Combined control/services/data planes) 4 GB Maximum memory DDR3 ECC DRAM (Combined control/services/data planes) 16 GB Default memory DDR3 ECC DRAM (data plane) NA Maximum memory DDR3 ECC DRAM (data plane) NA Default memory DDR3 ECC DRAM (control/services plane) NA Maximum memory DDR3 ECC DRAM (control/services plane) NA Default flash memory 4 GB Maximum flash memory 16 GB External USB 2.0 slots (type A) 1 USB console port -type B mini (up to 115.2 kbps) 1 Serial console port - RJ45 (up to 115.2 kbps) 1 Serial auxiliary port - RJ45 (up to 115.2 kbps) 1 Power-supply options Internal: AC and PoE Redundant power supply N/A AC input voltage 100 to 240 VAC autoranging AC input frequency 47 to 63 Hz AC input current range, AC power supply (maximum) 3 to 1.3A AC input surge current 60 A peak and less than 5 Arms per half cycle Typical power (no modules) (watts) 42 Maximum power with AC power supply (watts) 250 Maximum power with PoE power supply (platform only) (watts) 530 Maximum endpoint PoE power available from PoE power supply (watts) 250

Frequently Asked Questions

What is Cisco ISR4331-VSEC/K9?

The ISR4331-VSEC/K9 is a Cisco 4000 Series Integrated Services Router bundle that combines Voice (UC) + Security (SEC) licensing with enterprise branch routing. It is built for organizations that need secure WAN connectivity and unified communications on a single branch router platform.

What does “VSEC” mean in ISR4331-VSEC/K9?

“VSEC” means the router includes both: Voice / Unified Communications (UC) features Security bundle (SEC) licensing This combination enables secure VoIP, encrypted signaling, and branch telephony while maintaining enterprise-grade WAN routing — a very common search topic among Cisco buyers.

What is ISR4331-VSEC/K9 mainly used for?

This model is widely used for: Secure branch WAN routing Voice gateway and unified communications VPN branch connectivity Voice + data convergence Small to medium enterprise branch offices It allows businesses to run secure networking and enterprise voice from one device.

What is the throughput of Cisco ISR4331-VSEC/K9?

The ISR4331-VSEC/K9 supports 100 Mbps to 300 Mbps aggregate throughput, depending on licensing and configuration. This makes it suitable for small-to-mid enterprise branches handling voice, video, and business applications.

What ports and expansion slots are available on ISR4331-VSEC/K9?

Typical hardware includes: 3 × onboard WAN/LAN Gigabit ports 2 × RJ-45 ports 2 × SFP-based ports 2 × NIM expansion slots 1 × SM-X service module slot This modular design enables flexible expansion for WAN and voice modules.

Does ISR4331-VSEC/K9 support VoIP and unified communications?

Yes. The VSEC bundle supports enterprise voice security features such as: SRTP media encryption Secure RTCP SIP/H.323 secure signaling SRST failover support This makes it ideal for secure branch telephony deployments.

Does ISR4331-VSEC/K9 include advanced security features?

Yes. Security capabilities include: IPsec VPN support Secure signaling encryption AES-128 encryption TLS and HMAC authentication These features help secure voice and data traffic between branches and HQ.

Is ISR4331-VSEC/K9 SD-WAN ready?

Yes. ISR 4000 Series routers support Cisco IOS XE SD-WAN, allowing centralized policy-based WAN control and application-aware routing for distributed enterprise branches.

Is Cisco ISR4331-VSEC/K9 still supported?

Yes — but it has entered lifecycle transition: End-of-Sale: 7 Nov 2023 End-of-Support: 30 Nov 2028 This lifecycle information is frequently searched by enterprises planning upgrades or migration paths.

What is the difference between ISR4331-VSEC/K9 and ISR4331-SEC/K9?

Key difference: ISR4331-SEC/K9 → Security bundle only ISR4331-VSEC/K9 → Voice + Security bundle (UC + SEC) The VSEC version is chosen when organizations need secure voice services integrated into branch routing

What is the upgrade path or replacement for ISR4331-VSEC/K9?

Cisco migration guidance commonly points toward the Cisco Catalyst C8200 Series, which offers modern SD-WAN architecture and longer lifecycle support for enterprise WAN environments.


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