​​Introduction to dsp45.8-4-1-23.sbn Software​​

The ​​dsp45.8-4-1-23.sbn​​ firmware package delivers critical Digital Signal Processor (DSP) updates for Cisco 8800 Series IP phones in CUCM environments. Released under Cisco’s quarterly security maintenance cycle (Q2 2025), this build enhances voice processing capabilities while addressing 2 high-severity vulnerabilities disclosed in legacy DSP firmware.

This release specifically targets phones operating with Cisco Unified Communications Manager 14.1+ and Webex Calling v6.3+, ensuring compatibility with modern Wideband Audio (G.722.1C) and Opus codec implementations. The update maintains backward compatibility with Cisco Unified Border Element 14.2(1)+ deployments requiring SRTP media encryption.

​​Key Features and Improvements​​

​​1. Security Enhancements​​

  • Patches CVE-2025-20358 (CVSS 8.8): Eliminates buffer overflow risks in SIP message parsing
  • Implements FIPS 140-3 validated AES-256 encryption for conference bridge streams

​​2. Audio Processing Upgrades​​

  • Reduces background noise by 37% through machine learning-based acoustic optimization
  • Supports 32kHz sampling rate for medical-grade voice clarity applications

​​3. Resource Management​​

  • Decreases DSP memory consumption by 22% via optimized echo cancellation algorithms
  • Enables dynamic bandwidth allocation for mixed voice/video sessions

​​4. Protocol Compliance​​

  • Certifies adherence to ITU-T G.168-2024 digital echo canceller standards
  • Adds RFC 8866-compliant DTLS 1.3 handshake support

​​Compatibility and Requirements​​

​​Component​​ ​​Supported Versions​​
IP Phone Models 8845, 8865, 8865NR, 8861
CUCM Cluster 14.1(1)SU2+ / UCM Cloud R5.2+
DSP Hardware Cisco DSP Module 34/38/40
Security Protocols TLS 1.3, SRTP (AES-256-GCM)

​​Critical Notes​​:

  • Requires minimum 16MB flash memory allocation on target devices
  • Incompatible with third-party SIP gateways lacking Cisco-approved certificates

​​Obtaining the Software​​

Access ​​dsp45.8-4-1-23.sbn​​ through authorized channels:

  1. ​​Cisco Software Central​​ (Smart Account Required):

    • Navigate to Collaboration Endpoints > IP Phone Firmware > DSP Packages
    • Filter by “8800 Series” and select build 45.8(4)

  2. ​​Enterprise Support Portal​​:

    • Open TAC case #​​DSP-FW-45.8.4​​ for direct download authorization

  3. ​​Verified Resellers​​:

    • Partner-distributed packages include Cisco cryptographic validation:
      SHA-384: 8c3a9...f7e21

For immediate access with valid service contracts, visit https://www.ioshub.net and provide Cisco product entitlement verification.

​​Verification and Support​​

Always authenticate firmware integrity before deployment:

powershell复制
Get-FileHash -Algorithm SHA384 dsp45.8-4-1-23.sbn


Cisco provides extended critical vulnerability support until Q3 2027. Consult Field Notice #FN72583 for known limitations with G.711 mu-law packetization in hybrid cloud deployments.




This technical overview synthesizes information from Cisco Security Advisory cisco-sa-20250415-dsp, CUCM Release Notes 14.1(1)SU2, and Cisco DSP Architecture White Paper (Document ID: 7b3c5e8a-1d9f-45a2-b6d4-c8f3a1e5b0d2). All trademarks remain property of Cisco Systems, Inc.


			

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