Cisco ISR4321-AXV/K9 for Voice and Intelligent WAN at Branch Offices
Product Overview
The Cisco ISR4321-AXV/K9 is an Application Experience (AX) and Voice-enabled (V) integrated services router from the Cisco ISR 4000 Series, designed for small to mid-sized enterprise branches that need advanced voice, WAN optimization, and application performance. This model includes the UC (Unified Communications) and AX technology licenses, enabling VoIP, CME, SRST, application visibility, WAAS, and QoS. With default throughput of 50 Mbps (upgradeable to 100 Mbps) and SD-WAN readiness, it delivers a secure, converged platform for voice and intelligent WAN deployments.
Product Details
| Specification | Description |
|---|---|
| Product Code | ISR4321-AXV/K9 |
| Series | Cisco ISR 4000 Series |
| Form Factor | 1RU Rack-Mountable (compact) |
| Default Throughput | 50 Mbps (scalable to 100 Mbps with license) |
| Processor | Cisco QuantumFlow Processor |
| System Memory (DRAM) | 4 GB (upgradeable to 8 GB) |
| Flash Storage | 4 GB (upgradeable to 32 GB) |
| Integrated GE Ports | 2 x 1G RJ45 + 1 x 1G SFP |
| NIM Slots | 2 |
| SM-X Slot | None |
| Voice License Included | Yes (UC Package – CME, SRST, voice gateway support) |
| AX License Included | Yes (Performance Routing, AVC, WAAS, PfR, NBAR2) |
| SD-WAN Capable | Yes |
| Security License | Not included (available separately) |
| Software | Cisco IOS XE |
| Virtualization Support | Supports KVM and container-based services |
Product Features
Includes Unified Communications (V) and Application Experience (AX) licenses
Enables VoIP, SRST, CME, and TDM gateway capabilities for enterprise voice
AX features support application visibility, WAN optimization, and PfR
Modular expansion via dual NIM slots for LTE, FXO/FXS, or additional interfaces
SD-WAN ready with intelligent path control, segmentation, and cloud readiness
Optional security license adds VPN, firewall, and advanced threat control
Ideal for voice-rich and application-sensitive branch environments
Similar Models Comparison
| Model | UC License | AX License | SEC License | Max Throughput | SD-WAN | Ideal Use Case |
|---|---|---|---|---|---|---|
| ISR4321-VSEC/K9 | Yes | No | Yes | 100 Mbps | Yes | Secure voice-enabled branches |
| ISR4321-AXV/K9 | Yes | Yes | No | 100 Mbps | Yes | Voice + app-aware small offices |
| ISR4321-V/K9 | Yes | No | No | 100 Mbps | Yes | Basic UC branch deployments |
Latest ISR 4321 Series Model Overview
| Model | Voice Enabled | AX Capable | Security Enabled | SD-WAN | Target Deployment |
|---|---|---|---|---|---|
| ISR4321-V/K9 | Yes | No | No | Yes | VoIP-ready small branches |
| ISR4321-VSEC/K9 | Yes | No | Yes | Yes | Secure UC branch |
| ISR4321-AXV/K9 | Yes | Yes | No | Yes | Voice + intelligent WAN branches |
