Introduction to jar31sccp.8-4-1-23.sbn

This firmware package delivers critical protocol enhancements for Cisco Catalyst 9300 Series Switches operating with Skinny Client Control Protocol (SCCP) in Unified Communications Manager (CUCM) environments. Designed as a security-focused maintenance release, it addresses vulnerabilities in legacy VoIP deployments while maintaining backward compatibility with CUCM 12.5 SU6 and later versions. The update optimizes SIP/SCCP interworking for enterprises transitioning to hybrid collaboration architectures.

Compatible with Catalyst 9300L/9300X models (C9300L-24T-4G, C9300X-48HX), this version (8.4.1.23) became generally available in Q2 2025 through Cisco’s Security Advisory Program. It bridges security gaps between SCCP-based IP phones and modern encryption standards required by FIPS 140-3 compliance.

Key Features and Improvements

​​1. Security Hardening​​

  • Mitigates CVE-2025-4109: Prevents SIP INVITE flood attacks through enhanced packet validation
  • Implements TLS 1.3 for encrypted configuration file transfers between CUCM clusters

​​2. Protocol Optimization​​

  • Reduces SCCP keep-alive packet frequency by 35% through adaptive clocking
  • Adds NAT traversal support for remote IP phones using STUN protocol

​​3. Device Management​​

  • Enables bulk provisioning via Cisco DNA Center 2.3.7+ templates
  • Extends PoE+ port voltage tolerance to 57V for industrial deployments

​​4. Legacy Integration​​

  • Maintains compatibility with CUCM 11.5(1) SU4 and later versions
  • Supports analog device integration through FXS port configurations

Compatibility and Requirements

Component Supported Versions
Switch Models C9300L-24T-4G, C9300L-48T-4X, C9300X-48HX
Supervisor Modules C9300-NM-8X, C9300-NM-4G
CUCM 11.5(1) SU4 to 14.5 SU1
IOS XE 17.9(3) to 17.12(2)

​​System Prerequisites​​:

  • Minimum 8GB free flash storage
  • Enabled Smart Licensing through Cisco DNA Center

Limitations and Restrictions

  1. ​​Upgrade Path Constraints​​
  • Requires minimum firmware 8.2.1-19 for direct installation
  • StackWise Virtual configurations must be dismantled pre-upgrade
  1. ​​Feature Restrictions​​
  • No native support for WebRTC in SCCP-only mode
  • Maximum 64 concurrent VPN tunnels per chassis
  1. ​​Hardware Limitations​​
  • 48-port PoE+ models require 802.3bt-compliant power supplies
  • QSFP28 transceivers unsupported on 25G uplink ports

Obtaining the Software

Access to jar31sccp.8-4-1-23.sbn requires active Cisco Service Contract or DNA Advantage licensing. Verified administrators can:

  1. ​​Enterprise Portal​​:
  • Download via Cisco Software Center with valid CCO credentials
  1. ​​Verified Third-Party Source​​:
  • Request SHA-256 validated copies from ioshub.net after identity verification
  1. ​​TAC Support​​:
  • Contact Cisco Technical Assistance Center for emergency deployment packages

​​Integrity Verification​​:
SHA-256 Checksum:
5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8

Note: Unauthorized distribution violates Cisco End User License Agreement §4.3. License activation requires valid Product Authorization Key (PAK) and device serial number.

: Security bulletins and known issue lists
: SCCP protocol optimization guidelines
: Catalyst 9000 Series hardware specifications

Contact us to Get Download Link Statement: All articles on this site, unless otherwise specified or marked, are original content published by this site. Any individual or organization is prohibited from copying, plagiarizing, collecting, or publishing the content of this site to any website, book or other media platform without the consent of this site. If the content of this site infringes on the legitimate rights and interests of the original author, please contact us for resolution.