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- Exam Code: 642-427
- Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
- Updated: Sep 14, 2026
- Q & A: 301 Questions and Answers
- PDF Version + PC Test Engine + Online Test Engine
- Value Pack Total: $119.98 $79.99
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Cisco 642-427 dumps - Testing Engine
- Exam Code: 642-427
- Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
- Updated: Sep 14, 2026
- Q & A: 301 Questions and Answers
- Software Price: $59.99
- Testing Engine
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Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Call Control and Dial Plan Troubleshooting | - Dial plan configuration issues
|
| Endpoints and Registration Issues | - Endpoint performance issues
|
| Voice Gateway and Protocol Troubleshooting | - Media and codec issues
|
| QoS and Network Integration | - Voice quality issues
|
| Voicemail and Unified Messaging | - Cisco Unity Connection troubleshooting
|
| Cisco Unified Communications Architecture Troubleshooting | - Cluster and server health issues
|
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Question #1
Cisco IP Phones are being installed on several different IP subnets in a new Cisco Unified Communications Manager installation. Phones are not registering to Cisco Unified CM.
Which three DHCP options must be set properly in each subnet for all phones to register to Cisco Unified Communications Manager? (Choose three.)
- A. option 150
- B. DNS server
- C. WINS server
- D. IP address and subnet mask
- E. default gateway
Correct Answer: A,D,E 🗳️
Question #2
You are a voice technician. If you are required to solve latency issues in a VoIP network, which measures will you take? (Select three.)
- A. Use dejitter buffers
- B. Increase bandwidth
- C. Prioritize voice packets
- D. Fragment data packets
Correct Answer: B,C,D 🗳️
Question #3
Some users report that they cannot dial out from headquarters on their Cisco IP Phones to PSTN users, but others can.
Which troubleshooting approach is the most direct to isolate the source of the failure of the users that cannot dial out to the PSTN?
- A. Use DNA to generate actual calls to the PSTN.
- B. Use RTMT to generate actual calls to the PSTN.
- C. Use RTMT to analyze the dialing permissions of the Cisco IP Phones.
- D. Use DNA to analyze the dialing permissions of the Cisco IP Phones.
Correct Answer: D 🗳️
Question #4
Refer to the exhibit.
The exhibit shows the output of a successful RSVP call setup that uses G.729 codec. What should the minimum bandwidth configuration on interface serial 0/1/0.121 for the command ip rsvp bandwidth be?
- A. 40 Kb/S
- B. 16 Kb/S
- C. 8 Kb/S
- D. 32 Kb/S
- E. 24 Kb/S
Correct Answer: A 🗳️
Explanation: Only visible for ITExamDownload members. You can sign-up / login (it's free).
Question #5
Which two log files contain the issues related to audio quality? (Choose two.)
- A. diag_CuSysAgent_*.uc
- B. diag_SttService_*.uc
- C. diag_CuCsMgr_*.uc
- D. diag_CuNotifier_*.uc
- E. diag_CuReportDataHarvester_*.uc
- F. diag_CuMixer_*.uc
Correct Answer: C,F 🗳️
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