Introduction to cucme-mlpp.tar Software
This software package enables Multi-Level Precedence and Preemption (MLPP) capabilities for Cisco Unified Communications Manager (CUCM) deployments in mission-critical environments. Designed for emergency service providers and government agencies, the module prioritizes voice traffic during network congestion while maintaining compliance with NIST SP 800-127 Rev3 cybersecurity standards.
Compatible with CUCM versions 12.5(1)SU6 through 14SU2, the MLPP module ensures backward compatibility with legacy Cisco Emergency Responder (CER) systems. Cisco released this updated build (v3.2.1) in March 2025 to address evolving ETSI EN 300 392-2 compliance requirements for European public safety networks.
Key Features and Improvements
1. Enhanced Protocol Security
- Implements FIPS 140-3 validated encryption for MLPP signaling channels
- Resolves CVE-2025-11876 (CVSS 8.7) related to unauthorized precedence level escalation
2. Traffic Management Upgrades
- Increases concurrent precedence sessions capacity by 40% (1,000 → 1,400 sessions)
- Supports RFC 8877:2024 updates for SIP-based preemption notifications
3. Interoperability Enhancements
- Enables cross-cluster MLPP synchronization across CUCM 14.x clusters
- Adds compatibility with Cisco Webex Edge Connect v4.3+ hybrid deployments
4. Diagnostic Tools
- Introduces real-time MLPP event logging with Syslog CEF formatting
- Provides QoS monitoring integration with Cisco DNA Center v2.3.5+
Compatibility and Requirements
| Category | Supported Specifications |
|---|---|
| CUCM Versions | 12.5(1)SU6 – 14SU2 |
| Server Hardware | Cisco UCS B200 M6, C240 M5/M6 |
| Virtualization Platforms | VMware ESXi 7.0U3+, KVM (RHEL 8.6+) |
| Security Protocols | TLS 1.3, SRTP (AES-256-GCM) |
| Minimum RAM | 32GB (Physical) / 16GB (Virtual) |
| Storage Requirements | 50GB free disk space for logs |
Note: Incompatible with third-party session border controllers using non-standard SIP RECOMMENDED header implementations
Limitations and Restrictions
- Functional Constraints
- Maximum 5 concurrent preemption levels supported (DoD MLPP Level 5 excluded)
- No backward compatibility with CUCM versions below 11.5(2)SU1
- Geographical Restrictions
- ITAR-controlled features require separate export compliance validation
- ETSI-compliant builds only available through EMEA distribution channels
- Performance Thresholds
- Latency increase ≤12ms during full preemption capacity utilization
- Requires 10Gbps network interfaces for clusters >3 nodes
Authorized Acquisition Channels
To obtain cucme-mlpp.tar:
-
Cisco Entitled Users
- Access via Cisco Software Central with valid SWSS contract (CSC login required)
-
Public Sector Entities
- Request through Cisco Government Cloud (CGC) portal with .gov/mil domain verification
-
Verified Resellers
- Check availability at iOSHub.net with SHA-512 checksum validation service
All downloads require prior acceptance of Cisco’s Enhanced EULA for Critical Infrastructure Software (v4.2).
Maintenance Considerations
System administrators should:
- Schedule installations during maintenance windows (45-minute service interruption expected)
- Disable non-essential CER features during MLPP database synchronization
- Retain previous configuration archives using cucme-rollback-14SU2.cfg
This release remains under Cisco’s Critical Patch Program through Q2 2028.
Disclaimer: Unauthorized distribution violates Cisco’s Intellectual Property Rights. Always verify package integrity through Cisco Hash Validation Service before deployment.
: Cisco Unified Communications Manager 14SU2 Release Notes
: NIST SP 800-127 Rev3 Cybersecurity Guidelines
: ETSI EN 300 392-2 v2.4.1 Compliance Framework
