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

642-427 Exam Simulator
  • Exam Code: 642-427
  • Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
  • Updated: Sep 10, 2026
  • Q & A: 301 Questions and Answers

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Cisco 642-427 Exam Syllabus Topics:

SectionObjectives
Topic 1: Voice Gateway and Protocol Troubleshooting- Media and codec issues
  • 1. RTP stream failures
    • 2. Codec mismatch and negotiation issues
      - Signaling protocols
      • 1. H.323 gateway troubleshooting
        • 2. SIP call setup and teardown issues
          • 3. MGCP gateway control problems
            Topic 2: Voicemail and Unified Messaging- Cisco Unity Connection troubleshooting
            • 1. Call handler and routing rules issues
              • 2. MWI (Message Waiting Indicator) failures
                Topic 3: Call Control and Dial Plan Troubleshooting- Call routing failures
                • 1. SIP trunk and gateway routing issues
                  • 2. Intra-cluster and inter-cluster routing
                    - Dial plan configuration issues
                    • 1. Route patterns and translation patterns
                      • 2. Calling search space misconfiguration
                        Topic 4: Cisco Unified Communications Architecture Troubleshooting- Cluster and server health issues
                        • 1. Publisher/subscriber synchronization issues
                          • 2. Service activation and dependency problems
                            - CUCM core components and services
                            • 1. Call processing and call control analysis
                              • 2. Database and service failure troubleshooting
                                Topic 5: Endpoints and Registration Issues- Endpoint performance issues
                                • 1. Phone registration failures
                                  • 2. Device firmware and compatibility issues
                                    - IP phone registration
                                    • 1. Device pool and load balancing problems
                                      • 2. DHCP and TFTP configuration issues
                                        Topic 6: QoS and Network Integration- Voice quality issues
                                        • 1. QoS marking and prioritization problems
                                          • 2. Jitter, latency, and packet loss analysis

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

                                            Question #1

                                            After a successful login using Cisco Extension Mobility, an IP phone performs a restart followed by a reset.
                                            What can cause this issue?

                                            • A. The locale that is configured on the phone is different than the locale that is configured in the user device profile.
                                            • B. The security profile that is specified in the user device profile does not match the security profile for the phone where the user logged in.
                                            • C. The user device profile and the phone that is used for the Cisco Extension Mobility log in do not use the same phone protocol.
                                            • D. The phone model to which the user logged in is a different model than the model that is configured in the user device profile.
                                            Reveal Solution  Discussion  0

                                            Correct Answer: A  🗳️

                                            Question #2

                                            Which two phones work in Cisco Unified Communications Manager Device Mobility? (Choose two.)

                                            • A. phones with an IP Addressing Mode set to IPv4 Only
                                            • B. phones with an IP address assigned by DHCP
                                            • C. phones with an IP Addressing Mode set to IPv6 Only
                                            • D. phones with an IP address assigned using NAT/PAT
                                            Reveal Solution  Discussion  0

                                            Correct Answer: A,B  🗳️

                                            Question #3

                                            You have just obtained a list of the following options:
                                            -All Patterns -Unassigned DN -Call Park -Conference -Directory Number -Translation Pattern -Call Pickup Group -Route Pattern -Message Waiting -Voice Mail -Attendant Console
                                            What have you selected in order to produce this list?

                                            • A. Route Plan > Route Plan Report
                                            • B. Route Plan > External Route Plan Wizard
                                            • C. Control Center > Feature Services
                                            • D. Dialed Number Analyzer
                                            Reveal Solution  Discussion  0

                                            Correct Answer: A  🗳️

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                                            Question #4

                                            The intrasite link is down on the Cisco Unity Connection due to DNS problems.
                                            Which two options restore the intrasite link? (Choose two.)

                                            • A. Synchronize voice names with the remote network.
                                            • B. Troubleshoot the external message store.
                                            • C. Change the hostname from FQDN to IP address.
                                            • D. Enable the directory synchronization.
                                            • E. Reboot the Cisco Unity Connection server.
                                            • F. Fix the DNS servers.
                                            Reveal Solution  Discussion  0

                                            Correct Answer: C,F  🗳️

                                            Question #5

                                            The G.729 codec is configured for branch office phones that call across the WAN link to headquarters. Cisco Unity Connection in headquarters is configured to accept only the G.711 codec. Branch users currently cannot access their voicemail.
                                            Which solution is best to enable voicemail for branch users and minimize WAN bandwidth utilization per call?

                                            • A. Enable transcoding resources on Cisco Unity Connection.
                                            • B. Enable transcoding resources on the branch office gateway.
                                            • C. Enable transcoding resources on the headquarters gateway.
                                            • D. Enable transcoding resources on Cisco Unified Communications Manager.
                                            Reveal Solution  Discussion  0

                                            Correct Answer: C  🗳️

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