Certification exams change, and study material has to keep up. The 642-427 (Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)) question bank at Actual4Exams is reviewed continuously and comes with 365 days of free updates, so your 2026 preparation always reflects the current exam.
Cisco 642-427 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) |
| Exam Number: | 642-427 |
| Available Languages: | English, Japanese |
| Certificate Validity Period: | 3 years |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 55-65 |
| Exam Format: | Multiple-answer, Simulation-based, Multiple-choice |
| Related Certifications: | CCNP Voice |
| Exam Price: | USD 300 |
| 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: Voice Gateways and Trunks | - SIP trunk troubleshooting - H.323 gateway troubleshooting - MGCP gateway troubleshooting - PSTN connectivity issues |
| Topic 2: Quality of Service and Voice Quality | - Latency, jitter, and packet loss analysis - Voice quality diagnostics - QoS verification and troubleshooting |
| Topic 3: Cisco Unified Communications Manager | - Call processing issues - Dial plan troubleshooting - Device registration problems |
| Topic 4: Media Resources | - Transcoders and conference bridges - Music on Hold and annunciators - Media Termination Points |
| Topic 5: Cisco Unified Presence and Mobility | - Presence service troubleshooting - Mobility and extension mobility issues |
| Topic 6: IP Phones and Endpoints | - Firmware and endpoint connectivity issues - Phone registration and provisioning |
| Topic 7: Cisco Unity and Voice Applications | - Voicemail integration issues - Messaging service troubleshooting |
| Topic 8: Troubleshooting Methodology | - Diagnostic tools and techniques - Structured troubleshooting process - Log and trace analysis |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) (642-427) — Questions Candidates Actually Ask
The 642-427 exam, officially known as Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0), is the Cisco test that leads to the CCNP Voice certification at the Professional level. Passing it validates the skills employers expect from a certified professional. It is also associated with related credentials such as CCNP Voice.
The 642-427 exam contains 55-65 questions, and you have 90 minutes to complete them. Work out your per-question pace before test day, and flag slow items instead of stalling on them — time pressure, not knowledge, sinks many first attempts. Timed mock exams in the Actual4Exams test engines are the most reliable way to build that rhythm.
Valid CCNA Voice or any active CCIE certification was required for the CCNP Voice certification path.
Entry requirements can change, so confirm the latest conditions on the official exam page: https://learningnetwork.cisco.com/s/exam-topics.
Yes. A free PDF demo of the Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) questions is available, so you can check the question style and answer quality before you pay. Every purchase also includes 365 days of free updates, and if the product expires you can renew the update service at a 50% discount from your member zone.
If you take the corresponding 642-427 exam within 60 days of purchase and do not pass, you can apply for a full refund under the 100% Money Back Guarantee: submit a scan of your enrollment slip and your official Score Report (PDF) within 2 days of the exam date, and the claim is processed within 7 days. Attempts made within 3 days of purchase, downloads without an actual exam attempt, free materials, and expired orders are not eligible, and the candidate name must match the payer name. Prefer new material instead of a refund? You can exchange your purchase for two free products of equal value and keep the update service on your original product. As for delivery, the files are available for instant download and are also emailed to you within one minute of payment — if nothing arrives within 2 hours, contact customer service. There is no limit on how many computers you can install the product on.
The official Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) outline is organized into 8 domains. The first three are:
- Troubleshooting Methodology
- Cisco Unified Presence and Mobility
- IP Phones and Endpoints
See the complete exam topics section above for the full outline and the weighting of every domain.
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
The CLI command utils dbreplication reset all was run on a Cisco Unified Communications Manager. However, replication failed to restart. Which course of action should be taken to resolve this issue?
- A. Restart the replication from the Cisco Unified Communications Manager RTMT tool.
- B. Issue the CLI command utils dbreplication runtimestate.
- C. Issue the CLI command utils dbreplication clusterreset.
- D. Issue the CLI command utils dbreplication reset.
- E. Issue the CLI command utils dbreplication clusterreset all.
Refer to the exhibits.
End-to-end RSVP with local RSVP fallback has been configured on the HO Cisco Unified Communications Manager. RSVP between the locations that are assigned to the IP phones and SIP trunk at the HQ site is configured as mandatory. When a call is placed from an HQ phone to a BR phone, the end-to-end RSVP request fails.
Refer to the SDI trace. Which statement about the call is true?
- A. The call will proceed as a normal call with no RSVP reservation.
- B. The Cisco Unified Communications Manager at HO will fall back to local RSVP and place the call No RSVP end-to-end will occur.
- C. The call will fail.
- D. Only local RSVP will take place at both the HQ and BR Cisco Unified Communications Managers.
- E. The Cisco Unified Communications Manager at HO will use end to end RSVP. The BR Cisco Unified Communications Manager will use local RSVP.
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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. Fragment data packets
- B. Prioritize voice packets
- C. Use dejitter buffers
- D. Increase bandwidth
Which two log files contain the issues related to audio quality? (Choose two.)
- A. diag_CuMixer_*.uc
- B. diag_CuReportDataHarvester_*.uc
- C. diag_CuSysAgent_*.uc
- D. diag_CuNotifier_*.uc
- E. diag_SttService_*.uc
- F. diag_CuCsMgr_*.uc
An H.323 gatekeeper maintains a separate gateway list, ordered by priority, for each of its zone prefixes. Suppose that a gateway does not have an assigned priority for a zone prefix. Please choose the default priority of this gateway.
- A. 10
- B. 5
- C. 32
- D. 0
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