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Updated: Oct 26, 2026
No. of Questions: 301 Questions & Answers with Testing Engine
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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 Duration: | 90-120 |
| Real Exam Qty: | 30-70 |
| Exam Format: | Simulation, Drag-and-Drop, Multiple Choice |
| Exam Price: | USD 250-300 |
| Certificate Validity Period: | 3 years |
| Related Certifications: | CCNP Collaboration (Legacy) Cisco Certified Specialist |
| Passing Score: | 825 / 1000 |
| Available Languages: | English, Japanese |
| Recommended Training: | Official Cisco Training: Troubleshooting Cisco Unified Communications v8.0 (TVOICE) |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Cisco 642-427 Sample Questions |
| Exam Way: | Onsite at Pearson VUE test centers / Online proctored |
| Pre Condition: | No mandatory prerequisites; recommended knowledge of CVOICE, IPT1, IPT2 and CUCM administration |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/tvoice.html |
Cisco 642-427 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Advanced Features and Applications | 20% | - Call Control Discovery (CCD) and SAF - Extension Mobility Cross Cluster - Media resources, voice quality, and QoS issues |
| Topic 2: Call Setup and Dial Plan Troubleshooting | 25% | - Globalized call routing and number transformation - Dial plan, route patterns, partitions, CSS, translation rules - Intrasite, intersite, and off-net call failures |
| Topic 3: CUCM and Registration Troubleshooting | 25% | - Endpoint and IP phone registration issues - CUCM service availability and database replication - Gateway and trunk registration (SIP, H.323, MGCP) |
| Topic 4: Integrated Solution Troubleshooting | 10% | - Presence and IM service troubleshooting - Unity Connection integration issues |
| Topic 5: Troubleshooting Methodology and Tools | 20% | - Systematic troubleshooting approach - Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
You are trying to access the GUI of Cisco Unified Communications Manager. However, it displays a "not accessible" error. In Cisco Unified Serviceability, which two services should you check for and ensure are running on the Control Center - Network Services page? (Choose two.)
- A. Cisco Trust Verification Service
- B. Cisco Tomcat Stats Servlet
- C. Cisco Certificate Expiry Monitor
- D. Cisco CallManager
- E. System Application Agent
- F. Cisco Tomcat
Correct Answer: D,F 🗳️
Refer to the exhibits.
The HG_MRG that is shown in the exhibit is assigned to an MRGL, which is configured at the HQ phones.
A call exists between two HQ phones that use G.711 codec. When one of the HQ users attempts to conference a BR phone across the WAN, the conference fails. The SDI trace shows an error "No transcoder device configured."
Which statement indicates the correct resolution or reason for the issue?
- A. The BR phone does not have access to a transcoder
- B. The CFB_2 bridge should be removed from the HQ_MRG and assigned to an MRG that is not assigned to an MRGL
- C. The BR phone does not have access to the CFB_2 bridge
- D. The BR phone does not have access to the HO_Conf bridge
- E. The CFB_2 bridge should be listed last in the HO_MRG
Correct Answer: E 🗳️
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In a Cisco Unified Communications Manager (CUCM) cluster, you receive a Database Communication Error when you attempt to login to the Publisher server. You need to resolve this issue.
Which two solutions should you try to resolve this issue? (Choose two.)
- A. Restart the DBL service on the publisher.
- B. Reboot all nodes in the cluster.
- C. Revert the changes for hostname or IP address on the Publisher server.
- D. Restart the DNS service in the cluster.
- E. Verify and ensure that the replication is working on all nodes in the cluster.
- F. Modify the hostname for all Subscriber nodes in the cluster.
Correct Answer: C,E 🗳️
Which size is the jitter buffer of the Cisco MTP transcoder?
- A. 45 - 60 ms
- B. 25 - 50 ms
- C. 10 - 30 ms
- D. 20 - 40 ms
Correct Answer: D 🗳️
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 Unified Communications Manager.
- B. Enable transcoding resources on Cisco Unity Connection.
- C. Enable transcoding resources on the branch office gateway.
- D. Enable transcoding resources on the headquarters gateway.
Correct Answer: D 🗳️
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