Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) : 642-427

  • Exam Code: 642-427
  • Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
  • Updated: Sep 01, 2026
  • Q & A: 301 Questions and Answers

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Cisco 642-427 Exam Syllabus Topics:

SectionObjectives
Voice Gateway and Protocol Troubleshooting- Media and codec issues
  • 1. Codec mismatch and negotiation issues
    • 2. RTP stream failures
      - Signaling protocols
      • 1. SIP call setup and teardown issues
        • 2. H.323 gateway troubleshooting
          • 3. MGCP gateway control problems
            Cisco Unified Communications Architecture Troubleshooting- CUCM core components and services
            • 1. Database and service failure troubleshooting
              • 2. Call processing and call control analysis
                - Cluster and server health issues
                • 1. Service activation and dependency problems
                  • 2. Publisher/subscriber synchronization issues
                    QoS and Network Integration- Voice quality issues
                    • 1. QoS marking and prioritization problems
                      • 2. Jitter, latency, and packet loss analysis
                        Voicemail and Unified Messaging- Cisco Unity Connection troubleshooting
                        • 1. MWI (Message Waiting Indicator) failures
                          • 2. Call handler and routing rules issues
                            Call Control and Dial Plan Troubleshooting- Dial plan configuration issues
                            • 1. Route patterns and translation patterns
                              • 2. Calling search space misconfiguration
                                - Call routing failures
                                • 1. Intra-cluster and inter-cluster routing
                                  • 2. SIP trunk and gateway routing issues
                                    Endpoints and Registration Issues- Endpoint performance issues
                                    • 1. Device firmware and compatibility issues
                                      • 2. Phone registration failures
                                        - IP phone registration
                                        • 1. DHCP and TFTP configuration issues
                                          • 2. Device pool and load balancing problems

                                            Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:

                                            Question 1

                                            Under normal conditions, what is the Cisco default attenuation level on a gateway?

                                            A. 0
                                            B. -6
                                            C. 3
                                            D. -15


                                            Question 2

                                            Refer to the exhibits.

                                            When a remote Cisco Unified Communications Manager learns the advertised patterns that are shown in the exhibit, which patterns would be shown in the Cisco Unified Communications Manager RTMT tool?

                                            A. +4989505552XXX and the ToDiD will be 0:
                                            B. 2XXX and the ToDiD will be 0:+498950555
                                            C. +498953121 2XXX and the ToDiD will be 0:
                                            D. Both +4989505552XXX and +4989531 21 2XXX will be advertised with ToDID of 0:
                                            E. 2XXX and the ToDiD will be 0+498953121


                                            Question 3

                                            Refer to the exhibit.

                                            HQ_MRGL is assigned to the HQ IP phones. BR_MRPGL is assigned to the BR IP phones. The remote site BR IP phones only support G711 codec. When a call is placed from HQ phone, the call fails. Which statement indicates how this issue is resolved?

                                            A. The Transcoder should be assigned to its own MRG, which should then be assigned to the default device pool at HQ.
                                            B. A Transcoder is not needed. The HQ phones will automatically change over to G 711 codec.
                                            C. Configure the Transcoder at the HQ site and assign it to HQ_MRG
                                            D. Configure the Transcoder at the BR site and assign it to BR_MRG


                                            Question 4

                                            Which command shows mismatched data across the Cisco Unified Communications Manager cluster?

                                            A. utils dbreplication refresh
                                            B. utils dbreplication clusterreset show data
                                            C. utils dbreplication status
                                            D. utils dbreplication repair


                                            Question 5

                                            Before a SAF client begins to forward, publish, subscribe, and update service data, with which option must it establish a relationship?

                                            A. SAF domains
                                            B. SAF Cisco Unified Communications Manager
                                            C. SAF service identifier
                                            D. SAF forwarder


                                            Solutions:

                                            Question 1
                                            Answer: A
                                            Question 2
                                            Answer: B
                                            Question 3
                                            Answer: D
                                            Question 4
                                            Answer: C
                                            Question 5
                                            Answer: D

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