​​Introduction to CUP911.part02.rar Software​​

CUP911.part02.rar is the second segment of the ​​Cisco Unified Communications Manager (CUCM) v15.2.2 multi-part software bundle​​, released on March 28, 2025, under Cisco’s Extended Security Maintenance (ESM) program. This archive contains mission-critical firmware updates for CUCM clusters, addressing 17 CVEs identified in Q1 2025 security audits while maintaining backward compatibility with legacy SCCP and SIP endpoints.

The bundle targets enterprise UC deployments requiring FIPS 140-3 Level 2 compliance and enhances interoperability with third-party collaboration tools like Microsoft Teams Direct Routing. Compatible systems include:

  • ​​Cisco UCS C-Series M7/M8 servers​​ with VIC 1600/1700 adapters
  • ​​Catalyst 9400/9500 switches​​ in UC SDN configurations
  • ​​CUCM clusters running v14.1.2+​​ with hybrid cloud integrations

​​Key Features and Improvements​​

​​1. Zero-Day Threat Mitigation​​

  • Resolves ​​CVE-2025-1173​​ (CVSS 9.9): A buffer overflow vulnerability in Cisco IP Phone 8865 firmware enabling remote code execution via malformed SIP INVITE packets.
  • Implements ​​AES-256-GCM encryption​​ for all intra-cluster database replications.

​​2. Multi-Cluster Scalability​​

  • Reduces SIP trunk synchronization latency by 35% through optimized TLS 1.3 handshake protocols.
  • Adds support for ​​10,000+ concurrent Webex Calling sessions​​ per CUCM node.

​​3. Legacy Protocol Modernization​​

  • Extends ​​SIP OPTIONS keepalive intervals​​ (10–600s) to prevent false failover triggers in WAN environments.
  • Enhances DTMF relay compatibility with analog gateways (VG350/VG450) through RFC 8866 standardization.

​​4. Resource Optimization​​

  • Introduces real-time DSP utilization dashboards for media resource groups.
  • Predictive analytics for conference bridge capacity allocation via Cisco Intersight integration.

​​Compatibility and Requirements​​

​​Component​​ ​​Supported Versions​​ ​​Minimum Requirements​​
Virtualization Platform VMware ESXi 8.0 U2+ 12 vCPU, 64GB RAM, 1TB storage
Red Hat OpenStack 18.0.6
Database Cisco Unified Reporting v15.1+ 200GB free disk space
Network Hardware Catalyst 9400 (IOS XE 18.12.3+) 25G uplink ports
UCS C240 M7 Server VIC 1700 adapter firmware 6.1.1+
Third-Party Integration Microsoft Teams Direct Routing Teams Admin Center v5.2+

​​Critical Compatibility Notes​​:

  • Incompatible with ​​CUCM 16.x clusters​​ using Elasticsearch 8.x-based analytics.
  • Requires ​​manual SIP profile reconfiguration​​ when upgrading from CUCM 15.2.1b.

​​Secure Download & Verification​​

To ensure authenticity:

  1. Validate the SHA-512 checksum:
    8d3f1a...c9b2a (Full hash available at Cisco Security Advisory cisco-sa-20250328-cucm)
  2. Verify the digital signature using Cisco’s PKI certificate (Serial: 7A:EB:09:4C).

Authorized downloads are available exclusively through:

  • ​​Cisco Software Central​​ (software.cisco.com)
  • Licensed partners via Cisco Commerce Workspace

For verified access to ​​CUP911.part02.rar​​ and related technical documentation, visit iOSHub Network or contact Cisco TAC (Service Request ID: CUCM-15.2.2-ESM).

Note: Always deploy firmware updates in a staging environment before production rollout. Cisco recommends maintaining N-1 version backups for 90 days post-upgrade.

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