ISR4321-VSEC/K9 Cisco ISR 4321 VSEC Bundle, w/UC, SEC Lic, CUBE-10

Cisco ISR4321-VSEC/K9 - Overview

The ISR 4321 is a modular, 1RU router designed for small to medium branch deployments. The VSEC bundle merges the capabilities of the Voice bundle and the Security bundle, giving enterprises a converged solution for collaboration and secure WAN access.

🔧 Key Hardware Specs

• Form Factor: 1RU rack-mountable router
• Performance:
  • 50 Mbps default throughput, software-upgradeable to 100 Mbps
• Interfaces:
  • 1x RJ45/SFP combo Gigabit Ethernet WAN/LAN ports
  • 1x RJ45 Gigabit Ethernet LAN port
  • 2x NIM (Network Interface Module) slots
  • 1x ISC (Internal Services Card) slot
    
• Memory/Storage:
  • 4 GB DRAM (upgradeable to 8 GB)
  • 4 GB flash (upgradeable to 8 GB)
    
• Software: Runs Cisco IOS XE

VSEC Bundle Features

Voice Features (V license):

• Cisco Unified Communications Manager Express (CME) - embedded call control for branch PBX functionality
• Cisco Survivable Remote Site Telephony (SRST) - ensures voice continuity during WAN outages
• Voice Gateway Services - SIP, H.323, MGCP, plus analog/digital voice interface support (via NIMs)
• Integrated Conferencing and Messaging - branch-level collaboration services

Security Features (SEC license):

• Zone-Based Firewall (ZBFW) - Stateful firewall with deep packet inspection
• VPN Services - IPsec, DMVPN, FlexVPN, SSL VPN
• Trustworthy Systems - Secure boot, image signing, runtime defenses
• Advanced Encryption - Strong cryptographic algorithms for compliance

🧩 Ideal Use Cases

• Branch offices needing both secure WAN connectivity and local voice/collaboration services
• Enterprises deploying hybrid UC solutions with centralized and branch-level voice
• Retail or distributed sites requiring VPN, firewall, and voice survivability in one device
• Organizations consolidating multiple functions (routing, security, UC) into a single ISR platform