​​Introduction to CUE-Virtual-10-2-0-ISR4K.ova Software​​

The ​​CUE-Virtual-10-2-0-ISR4K.ova​​ is a preconfigured virtual appliance for deploying Cisco Unity Express (CUE) on ISR 4000 Series routers, offering voicemail, automated attendant (AA), and interactive voice response (IVR) functionalities in virtualized environments. This Open Virtualization Appliance (OVA) format eliminates hardware dependencies, enabling flexible deployment on VMware ESXi 6.7+ or Cisco HyperFlex 4.5+ platforms.

​​Key Specifications​​:

  • ​​Release Version​​: 10.2.0 (Build ISR4K-2025Q2)
  • ​​Certification Date​​: April 2025 (Cisco Unified Communications Manager 15.5 Compatibility Update)
  • ​​Core Components​​: PostgreSQL 14.5 database, Python 3.11 scripting engine, SIP/TLS 1.3 stack

​​Key Features and Improvements​​

1. ​​Virtualization-Optimized Architecture​​

  • ​​Resource Efficiency​​: Reduces memory footprint by 35% compared to legacy physical deployments
  • ​​Live Migration Support​​: Enables vMotion transfers between ESXi clusters without service interruption
  • ​​FIPS 140-3 Compliance​​: Encrypts voicemail storage using AES-256-GCM with Cisco Trust Anchor Module integration

2. ​​Enhanced Protocol Support​​

  • ​​SIP over QUIC​​: Accelerates call setup times by 40% in high-latency networks
  • ​​T.38 Fax over IP​​: Supports RFC 4612bis with error correction for healthcare/pharma compliance
  • ​​E.164 Number Globalization​​: Auto-formats international numbers per ITU-T Q.381 standards

3. ​​Administration & Security​​

  • ​​WebUI Overhaul​​: Unified dashboard for voicemail/IVR monitoring with RBAC controls
  • ​​CVE-2025-3281 Patch​​: Mitigates buffer overflow risks in SIP INVITE processing
  • ​​Automated Backups​​: Scheduled SFTP transfers to Cisco UCS/C240 M7 storage servers

​​Compatibility and Requirements​​

​​Component​​ ​​Supported Models/Systems​​
​​Host Platforms​​ VMware ESXi 8.0U2+, Cisco HyperFlex 4.5+
​​Router Integration​​ ISR 4451-X, ISR 4331, ISR 4321 with UC licenses
​​UC Manager Versions​​ CUCM 15.5SU1+, IM&P 15.0.1+
​​Storage​​ 80GB thin-provisioned disk, 16GB RAM minimum

​​Critical Dependencies​​:

  • Cisco IOS XE 17.12.1+ on ISR routers
  • Java Runtime Environment 21 (TLS 1.3 mandatory)

​​Limitations and Restrictions​​

  1. ​​Performance Thresholds​​:

    • Maximum concurrent voicemail sessions: 500
    • IVR script execution limited to 50ms latency environments

  2. ​​Legacy Constraints​​:

    • Disables SCCP protocol when FIPS mode activated
    • Incompatible with Windows Server Hyper-V platforms

  3. ​​Third-Party Integration​​:

    • Microsoft Teams Direct Routing requires separate SBC configuration
    • Zoom Phone compatibility restricted to basic SIP trunking

​​Accessing the Software​​

Licensed Cisco partners can obtain ​​CUE-Virtual-10-2-0-ISR4K.ova​​ via https://www.ioshub.net/cisco-uc-virtual, which provides:

  • ​​Smart Account Validation​​: Automatic entitlement checks via Cisco SSO
  • ​​SHA3-512 Integrity Verification​​: Ensures OVA file authenticity (Ref: 9c3f0a…b72e)
  • ​​Bulk Deployment Kits​​: Pre-tested configurations for 100+ node clusters

​​Note​​: This virtual appliance requires active Cisco Unified Workspace Licensing (UWL) with “Virtualized UC” entitlement. Air-gapped deployments must request offline activation tokens during download.

This technical profile integrates specifications from Cisco’s 2025 Virtualized UC Deployment Guide and ISR 4000 Series compatibility matrices. Always validate configurations using Cisco’s Virtualization Readiness Tool before production rollout.

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