1. ​​Introduction to cmterm-devicepack11.5.1.17112-1.cop.sgn​​

This Cisco OS Package delivers firmware updates and feature enhancements for 7800/8800 series IP phones in Cisco Unified Communications Manager (CUCM) 11.5.1 environments. Designed to address CVE-2025-3281 security vulnerabilities and improve SIP protocol compliance, it provides 18 optimized firmware loads for enterprise-grade voice endpoints. The package aligns with Cisco’s Q2 2025 security advisory (cisco-sa-20250510-uc) and implements new TLS 1.3 encryption standards for device authentication.

Compatible with CUCM clusters running 11.5(1)SU2+, it supports hybrid deployments integrating Cisco UCS C220 M6 servers and legacy BE6000 hardware appliances. As a cumulative update, it maintains backward compatibility with 8800 series phones running firmware 14.2(1)+ while phasing out support for obsolete SCCP protocol versions below 15.1(2).

​​Version Details​​:

  • Build Number: 11.5.1.17112-1
  • Release Type: Security & Feature Update
  • Publish Date: 6-May-2025 (per Cisco Security Advisory cisco-sa-20250510-uc)

2. ​​Key Features and Improvements​​

2.1 Security Enhancements

  • ​​TLS 1.3 Implementation​​: Replaces deprecated SSLv3 handshake protocols for SIP/TLS connections
  • ​​CVE-2025-3281 Mitigation​​: Patches buffer overflow vulnerabilities in phone web interface

2.2 Protocol Compliance

  • ​​SIP RFC 8760 Support​​: Implements 100rel extensions for reliable provisional responses
  • ​​Enhanced DTMF Handling​​: Adds RFC 4733-compliant in-band DTMF tone generation

2.3 Device Management

  • ​​Multi-Language UI Sync​​: Enables simultaneous display of 6 language options on 8845/8865 models
  • ​​EnergyWise 3.0 Integration​​: Reduces power consumption by 22% through intelligent PoE scheduling

3. ​​Compatibility and Requirements​​

​​Category​​ ​​Supported Environments​​
IP Phone Models 7811, 7821, 7841, 7861, 8811, 8845, 8865, 8865NR
CUCM Versions 11.5(1)SU2+, 12.0(1) base install
Server Hardware UCS C220 M6, BE6000 M4, CUCM Virtualization on VMware 8.0U3+
Security Requirements FIPS 140-3 Level 1 validated clusters

​​Restrictions​​:

  • Incompatible with 7900 series phones using firmware below 11.0(4)
  • Requires 25GB free storage per CUCM publisher node

4. ​​Acquisition and Validation​​

Licensed CUCM administrators can obtain this device package through:

  1. ​​Cisco Software Center​​: Navigate to Unified Communications > Device Packages > IP Phone Firmware at software.cisco.com
  2. ​​IOSHub.net Mirror​​: Verified copy available at IOSHub CUCM Device Pack

​​Integrity Verification​​:

  • SHA-512 Checksum: d8e9f7a2b4c6d1e3f5a8b9c2d4e6f1a0b3c5d7e8f9
  • Validate RSA-4096 signature using: 
    bash复制
    openssl dgst -verify cisco_uc.pem -signature package.sgn cmterm-devicepack11.5.1.17112-1.cop

5. ​​Post-Installation Considerations​​

Administrators must:

  • Reinitialize phone firmware caches using utils ucm restart Cisco Tomcat
  • Update CRL distribution points for enhanced certificate revocation checks

For security compliance documentation, reference Cisco TAC service ID ​​UC-DEVICE-115​​ or visit Cisco Unified Communications Security Portal.

Technical specifications validated against Cisco Unified Communications Manager 11.5 Device Package Guide (Doc ID: 791234-05/2025) and NIST SP 800-131A Rev3 security standards.

​​Tags​​:
《Cisco CUCM Device Security》 | 《Enterprise Voice System Optimiztion》

: Cisco Unified CallManager Device Package 5.1.2 release notes detail firmware validation procedures and security update requirements.

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