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Updated: Sep 06, 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 |
| Available Languages: | Japanese, English |
| Related Certifications: | CCNP Voice |
| Exam Format: | Multiple-answer, Multiple-choice, Simulation-based |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 55-65 |
| Certificate Validity Period: | 3 years |
| 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 |
|---|---|
| Cisco Unified Presence and Mobility | - Mobility and extension mobility issues - Presence service troubleshooting |
| IP Phones and Endpoints | - Firmware and endpoint connectivity issues - Phone registration and provisioning |
| Quality of Service and Voice Quality | - Voice quality diagnostics - QoS verification and troubleshooting - Latency, jitter, and packet loss analysis |
| Media Resources | - Transcoders and conference bridges - Music on Hold and annunciators - Media Termination Points |
| Voice Gateways and Trunks | - SIP trunk troubleshooting - MGCP gateway troubleshooting - H.323 gateway troubleshooting - PSTN connectivity issues |
| Troubleshooting Methodology | - Diagnostic tools and techniques - Structured troubleshooting process - Log and trace analysis |
| Cisco Unity and Voice Applications | - Messaging service troubleshooting - Voicemail integration issues |
| Cisco Unified Communications Manager | - Dial plan troubleshooting - Device registration problems - Call processing issues |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Question 1
If you need to avoid choppy speech, what is the maximum tolerable round-trip delay between two VoIP endpoints?
A. 100 ms
B. 400 ms
C. 500 ms
D. 200 ms
E. 800 ms
F. 300 ms
Question 2
Which QoS methodology combines strict priority queuing with class-based weighted fair queuing?
A. Multilink
B. RSVP
C. IP RTP Priority
D. IP Frame Relay RTP Priority
E. LLQ
Question 3
Which method can be used to correct database replication issues in a cluster running Cisco
Unified CallManager 5.0?
A. Use the Informix database utility to recreate the database subscription.
B. Use the SQL Server Enterprise Manager application to recreate the database subscription.
C. Execute the dblhelper utility on the publisher.
D. Run the Cisco Unified CallManager BARS utility to restore the database to the subscriber.
E. Enter the utils dbreplication repair command at the command-line prompt.
Question 4
Two Cisco Unified Communications Manager clusters have recently been installed. One is in Tokyo and the other in Chicago connected by a WAN link. You have started the configuration of a SIP trunk and you are integrating the dial plans. All phones in Tokyo can call all phones in Chicago, but no phones in Chicago can call Tokyo phones.
Which two statements are possible causes? (Choose two.)
A. The Tokyo SIP trunk inbound CSS does not contain the partition of the Tokyo phones.
B. The SIP trunk in Chicago is in a CSS that is not in the partition of the Chicago phones.
C. The CSS of the Chicago phones does not include the partition of the route pattern to point to Tokyo.
D. The SIP trunk is configured from Tokyo to Chicago, but not from Tokyo to Chicago.
E. Tokyo phones are in a CSS that is not in the partition of the route pattern to call from Tokyo to Chicago.
Question 5
Which two of the following signaling protocols are peer-to-peer protocols? (Select two.)
A. SCCP
B. H.323
C. MGCP
D. SIP
Solutions:
| Question 1 Answer: F | Question 2 Answer: E | Question 3 Answer: E | Question 4 Answer: A,C | Question 5 Answer: B,D |
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