Cisco Troubleshooting Unified Communications (TUC) 642-426 Certified Exam Dumps

642-426 Exam Dumps

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Certification Provider: Cisco
Exam Code / Number: 642-426
Exam Name: Troubleshooting Unified Communications (TUC)
Exam Questions: 283
Last Updated: Jul 20, 2026
Corresponding Certification: Others

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Cisco 642-426 Exam Syllabus Topics:

SectionObjectives
Cisco Unity Connection and Unified Messaging Troubleshooting- Voicemail system issues
  • 1. Integration with CUCM
    • 2. Message delivery and retrieval problems
      Voice Gateway and Protocol Troubleshooting- Signaling protocols
      • 1. SIP call failures and debugging
        • 2. H.323 and MGCP troubleshooting
          - PSTN and trunk issues
          • 1. ISDN and analog trunk failures
            • 2. Gateway registration and media negotiation issues
              Media and Quality Troubleshooting- QoS and network impact
              • 1. Latency, jitter, and packet loss impact on voice
                • 2. QoS configuration verification
                  - Audio and codec issues
                  • 1. Codec mismatch and negotiation failures
                    • 2. One-way audio and no audio conditions
                      Cisco Unified Communications Manager (CUCM) Troubleshooting- Dial plan and routing issues
                      • 1. Partitions, calling search spaces, route patterns
                        • 2. Digit analysis troubleshooting
                          - Call processing issues
                          • 1. Call setup and teardown failures
                            • 2. Device registration and SCCP/SIP issues
                              Cisco Unified Communications Troubleshooting Fundamentals- Troubleshooting methodology and tools
                              • 1. Cisco UC diagnostic utilities and logs
                                • 2. Structured troubleshooting approaches (OSI model, layered diagnostics)


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