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Updated: Sep 10, 2026
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Cisco 642-427 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) |
| Exam Number: | 642-427 |
| Exam Price: | USD 300 |
| Exam Format: | Multiple-choice, Simulation-based, Multiple-answer |
| Real Exam Qty: | 55-65 |
| Certificate Validity Period: | 3 years |
| Exam Duration: | 90 minutes |
| Related Certifications: | CCNP Voice |
| Available Languages: | English, Japanese |
| Sample Questions: | Cisco 642-427 Sample Questions |
| Exam Way: | Proctored exam delivered at Pearson VUE testing centers. |
| Pre Condition: | Valid CCNA Voice or any active CCIE certification was required for the CCNP Voice certification path. |
| Official Syllabus URL: | https://learningnetwork.cisco.com/s/exam-topics |
Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Cisco Unified Communications Manager | - Dial plan troubleshooting - Call processing issues - Device registration problems |
| Topic 2: Quality of Service and Voice Quality | - QoS verification and troubleshooting - Latency, jitter, and packet loss analysis - Voice quality diagnostics |
| Topic 3: Cisco Unified Presence and Mobility | - Presence service troubleshooting - Mobility and extension mobility issues |
| Topic 4: Cisco Unity and Voice Applications | - Voicemail integration issues - Messaging service troubleshooting |
| Topic 5: Troubleshooting Methodology | - Diagnostic tools and techniques - Structured troubleshooting process - Log and trace analysis |
| Topic 6: Media Resources | - Transcoders and conference bridges - Media Termination Points - Music on Hold and annunciators |
| Topic 7: Voice Gateways and Trunks | - H.323 gateway troubleshooting - SIP trunk troubleshooting - PSTN connectivity issues - MGCP gateway troubleshooting |
| Topic 8: IP Phones and Endpoints | - Firmware and endpoint connectivity issues - Phone registration and provisioning |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Which of these is used by the Cisco IP phone to relay to the switch the information regarding how much power is needed?
- A. Cisco IP phones always use a fixed power consumption hased on the resistor, which is specific to the model
- B. IEEE 802.10 protocol
- C. the Cisco Discovery Protocol
- D. The switch model determines how much power is consumed by the different phone models
Correct Answer: C 🗳️
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Which command should you use to resolve a jerky speed issue?
- A. comfort-echo
- B. echo-cancel enable
- C. playout-delay
- D. comfort-noise
- E. echo-cancel coverage
- F. show voice port
Correct Answer: C 🗳️
Refer to the exhibit. You have received a trouble ticket stating that calls to international numbers are failing. To place an international call, users dial the access code "9," followed by "011," the country code, and the destination number. After entering the debug isdn q931 command on the MGCP gateway, you have the user attempt the call again.
Based on the debug output, what is the most likely cause of this problem?
- A. The circuit is not configured correctly or has a physical layer issue.
- B. Cisco Unified CallManager is not stripping the access code before sending the call to the gateway.
- C. The TON is incorrect.
- D. The user's CSS does not permit international calls.
- E. The gateway dial peer needs to prefix "011" to the called number so the PSTN knows this is an international call.
Correct Answer: A 🗳️
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Users are making calls from Cisco IP Phones that are registered on a Cisco Unified Communications Manager cluster through an H.323 gateway to the PSTN phones. Sometimes these users report that calls are dropped after they have talked for some time. Different Cisco Unified CM servers have been rebooted for testing during production hours. Currently Cisco IOS
12.0 is used on the H.323 gateway.
Which change helps to prevent calls from dropping when a Cisco Unified CM server is rebooted during testing?
- A. A misconfiguration of VoIP dial peers to the Cicso Unified CM servers must exist. Reconfigure the VoIP dial peers.
- B. There is no scenario where rebooting an H.323 gateway will allow call survivability.
- C. A misconfiguration of calling search spaces must exist. Reconfigure the CSS.
- D. Upgrade the gateway Cisco IOS software to a version later than 12.4(4)9T.
Correct Answer: D 🗳️
Which two methods can be used to correct database replication issues in a cluster running Cisco Unified CallManager 4.1? (Choose two.)
- A. Use the Informix database utility to recreate the database subscription.
- B. Execute the dblhelper utility on the publisher.
- C. Run the Cisco Unified CallManager BARS utility to restore the database to the subscriber.
- D. Use the SQL Server Enterprise Manager application to recreate the database subscription.
- E. Enter the utils dbreplication repair command at the command-line prompt.
Correct Answer: B,D 🗳️
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