- Exam Code: 642-427
- Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
- Updated: Sep 18, 2026
- Q & A: 301 Questions and Answers
Cisco 642-427 Exam : Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
PDF Version DemoAbout Cisco 642-427 Exam
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Cisco 642-427 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Integrated Solution Troubleshooting | 10% | - Unity Connection integration issues - Presence and IM service troubleshooting |
| Topic 2: Troubleshooting Methodology and Tools | 20% | - Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs - Systematic troubleshooting approach |
| Topic 3: Advanced Features and Applications | 20% | - Media resources, voice quality, and QoS issues - Extension Mobility Cross Cluster - Call Control Discovery (CCD) and SAF |
| Topic 4: 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 5: Call Setup and Dial Plan Troubleshooting | 25% | - Intrasite, intersite, and off-net call failures - Globalized call routing and number transformation - Dial plan, route patterns, partitions, CSS, translation rules |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Question #1
You are a network technician with many years' experience. Many users complain that they can hear echo when their calls go out an H.323 gateway. You have made some testing for the gateway and have changed the configuration. So the ERL level turns to be 6 dB. Furthermore, the echo-cancel coverage value is raised to 64 ms. Please choose the effect on the voice quality after this modification.
- A. The increase in echo-cancel coverage will have no effect on voice quality.
- B. The echo canceller will take 2-3 seconds longer to converge at the beginning of the call.
- C. The ends of sentences will be chopped by the echo canceller.
- D. Consonants will be chopped by the echo canceller.
Correct Answer: B 🗳️
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Question #2
MGCP use which call control model?
- A. Distributed
- B. Hybrid
- C. Ad hoc
- D. Centralized
Correct Answer: D 🗳️
Question #3
Refer to the exhibit. You have received a trouble ticket stating that users cannot place calls to the PSTN. During testing you discover the gateway is not switching to the secondary call agent when the primary call agent is unreachable.
What needs to be done to allow the MGCP gateway to use a different call agent if the primary fails?
- A. A Cisco Unified CallManager group that includes the secondary call agent needs to be assigned to the gateway.
- B. The ccm-manager fallback-mgcp command needs to be added to the gateway.
- C. The gateway needs to be defined as a non-gatekeeper-controlled intercluster trunk with the secondary Cisco Unified CallManager defined.
- D. The ccm-manager redundant-host command needs to be added to the gateway.
Correct Answer: D 🗳️
Question #4
Refer to the exhibit.
When a Cisco Unified Communications Manager Express advertises the directory number pattern in the exhibit, what would the learned pattern be in the RTMT tool on the Cisco Unified Communications Manager?
- A. 4XXX and the ToDID will be 0:+1972555
- B. 4XXX and the ToDID will be 0:+19725554XXX
- C. 4XXX and the ToDID will be 0:19725554XXX
- D. 4XXX and the ToDID will be 0:1972555
- E. 19725554XXX and the ToDID will be 0:+1972555
Correct Answer: D 🗳️
Explanation: Only visible for Exam4Tests members. You can sign-up / login (it's free).
Question #5
Which command should you use to resolve a jerky speed issue?
- A. playout-delay
- B. comfort-noise
- C. echo-cancel enable
- D. show voice port
- E. echo-cancel coverage
- F. comfort-echo
Correct Answer: A 🗳️
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