Cisco 642-426 exam dumps : Troubleshooting Unified Communications (TUC)

  • Exam Code: 642-426
  • Exam Name: Troubleshooting Unified Communications (TUC)
  • Updated: Aug 29, 2026     Q & A: 283 Questions and Answers

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Cisco 642-426 Exam Syllabus Topics:

SectionObjectives
Topic 1: 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. One-way audio and no audio conditions
        • 2. Codec mismatch and negotiation failures
          Topic 2: Cisco Unified Communications Troubleshooting Fundamentals- Troubleshooting methodology and tools
          • 1. Cisco UC diagnostic utilities and logs
            • 2. Structured troubleshooting approaches (OSI model, layered diagnostics)
              Topic 3: Voice Gateway and Protocol Troubleshooting- PSTN and trunk issues
              • 1. Gateway registration and media negotiation issues
                • 2. ISDN and analog trunk failures
                  - Signaling protocols
                  • 1. SIP call failures and debugging
                    • 2. H.323 and MGCP troubleshooting
                      Topic 4: Cisco Unity Connection and Unified Messaging Troubleshooting- Voicemail system issues
                      • 1. Message delivery and retrieval problems
                        • 2. Integration with CUCM
                          Topic 5: Cisco Unified Communications Manager (CUCM) Troubleshooting- Call processing issues
                          • 1. Device registration and SCCP/SIP issues
                            • 2. Call setup and teardown failures
                              - Dial plan and routing issues
                              • 1. Digit analysis troubleshooting
                                • 2. Partitions, calling search spaces, route patterns

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