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Updated: Sep 16, 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 Duration: | 90 minutes |
| Real Exam Qty: | 55-65 |
| Exam Format: | Multiple-choice, Multiple-answer, Simulation-based |
| Related Certifications: | CCNP Voice |
| Exam Price: | USD 300 |
| Available Languages: | Japanese, English |
| 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 Unity and Voice Applications | - Messaging service troubleshooting - Voicemail integration issues |
| Cisco Unified Presence and Mobility | - Presence service troubleshooting - Mobility and extension mobility issues |
| Voice Gateways and Trunks | - H.323 gateway troubleshooting - PSTN connectivity issues - MGCP gateway troubleshooting - SIP trunk troubleshooting |
| Media Resources | - Media Termination Points - Transcoders and conference bridges - Music on Hold and annunciators |
| Quality of Service and Voice Quality | - Latency, jitter, and packet loss analysis - Voice quality diagnostics - QoS verification and troubleshooting |
| Troubleshooting Methodology | - Log and trace analysis - Diagnostic tools and techniques - Structured troubleshooting process |
| Cisco Unified Communications Manager | - Call processing issues - Device registration problems - Dial plan troubleshooting |
| IP Phones and Endpoints | - Phone registration and provisioning - Firmware and endpoint connectivity issues |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Which information can be used to troubleshoot dropped calls?
- A. system logs
- B. Call Manager traces
- C. Cisco Discovery Protocol neighbor output
- D. switch port configurations
Correct Answer: B 🗳️
Refer to the exhibit.
When an HQ caller places a call to extension 4001 the phone at BR2 rings. Alter the user at BR2 goes off hook, the call is disconnected. Examine the debug voice ccapi coice inout command output. What caused this issue?
- A. The BR2 router is sending the call to dial-peer 20003 which is a POTS dial-peer.
- B. The destination phone is not registered.
- C. The BR2 router does not have a matching inbound dial peer.
- D. There is a codec mismatch between the source and destination. Codec negotiation failed
Correct Answer: D 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
As a network technician, you should be familiar with various commands. Which command displays a count of successful and unsuccessful control commands?
- A. show mgcp statistics
- B. show mgcp calls
- C. show mgcp
- D. debug mgcp statistics
Correct Answer: A 🗳️
Explanation: Only visible for TrainingQuiz members. You can sign-up / login (it's free).
Which QoS methodology combines strict priority queuing with class-based weighted fair queuing?
- A. IP Frame Relay RTP Priority
- B. Multilink
- C. RSVP
- D. IP RTP Priority
- E. LLQ
Correct Answer: E 🗳️
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DRAG DROP
Correct Answer:
Explanation:
The router or gateway matches these items in this order:
1.Called number (DNIS) with the incoming called-number command. First, the router or gateway attempts to match the called number of the call setup request with the configured incoming called-number of each dial peer. Because call setups always include DNIS information, it is recommended to use the incoming callednumber command for inbound dial peer matching
2.Calling Number (ANI) with the answer-address command If no match is found in step 1, the router or gateway attempts to match the calling number of the call setup request with the answer-address of each dial peer. This attribute can be useful in situations where you want to match calls based on the calling number (originating)
3.Calling Number (ANI) with the destination-pattern command If no match is found in step 2, the router or gateway attempts to match the calling number of the call setup request to the destination-pattern of each dial peer. For more information about this, see the first bullet in the Dial Peer Additional Information section of this document.
4.Originating Voice-port (associated with the incoming call setup request) with configured dial peer port ( applicable for inbound POTS call legs) If no match is found in the step 3, the router or gateway attempts to match the configured dial peer port to the voice-port associated with the incoming call. If multiple dial peers have the same port configured, the dial peer first added in the configuration is matched.
5.If no match is found in the first four steps, then the default dial peer 0 (pid:0)command is used. LINK: http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010fed1.shtml
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