Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
Certification Provider: Cisco
Corresponding Certification: CCNP Voice
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Instant Download 642-427 Exam Dumps : Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
Updated: Sep 22, 2026
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Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Cisco Unified Presence and Mobility | - Mobility and extension mobility issues - Presence service troubleshooting |
| Cisco Unified Communications Manager | - Call processing issues - Device registration problems - Dial plan troubleshooting |
| Cisco Unity and Voice Applications | - Messaging service troubleshooting - Voicemail integration issues |
| Troubleshooting Methodology | - Structured troubleshooting process - Diagnostic tools and techniques - Log and trace analysis |
| Media Resources | - Media Termination Points - Music on Hold and annunciators - Transcoders and conference bridges |
| IP Phones and Endpoints | - Firmware and endpoint connectivity issues - Phone registration and provisioning |
| Quality of Service and Voice Quality | - QoS verification and troubleshooting - Voice quality diagnostics - Latency, jitter, and packet loss analysis |
| Voice Gateways and Trunks | - H.323 gateway troubleshooting - SIP trunk troubleshooting - PSTN connectivity issues - MGCP gateway troubleshooting |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
When a Cisco Unified Border Element is deployed to support RSVP-based CAC, which method is required?
- A. RSVP-based CAC requires Cisco Unified Border Element to use media flow-through.
- B. RSVP-based CAC only supports media flow-around
- C. RSVP-based CAC can be supported with either media flow-through or media flow-around if the Cisco Unified Communication manager is configured as an RSVP agent
- D. The Cisco Unified Border Element does not have to participate in the RSVP message exchange and will pass RSVP message through unchanged using media flow-around.
Correct Answer: C 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
Refer to the exhibit.
How does a switch port that receives marked traffic from a Cisco IP phone use the mls qos trust cos command?
- A. For non-IP packets, the CoS is set to 7 and DSCP-to-CoS mapping is not applied.
- B. The DSCP-to-CoS map is applied.
- C. CoS is used to select the ingress and egress queues.
- D. The CoS setting is modified according to the CoS-to-DSCP map.
Correct Answer: D 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
You have added a subscriber server to your Cisco Unified CallManager 5.0 cluster. The server is functioning properly, but regular updates from the publisher are failing. All other publisher-subscriber communications are working properly in the cluster.
What is the problem?
- A. the Cisco Unified CallManager Administrator username and password have been changed in the publisher
- B. the service isn't included in the current CTL client
- C. the correct username and password are not being applied in the subscriber
- D. the CTL client wasn't signed with the security token when the service was included in it
- E. the MIC for the service needs to be included in the CTL client
Correct Answer: C 🗳️
Which tool allows the administrator to analyze call routing in Cisco Unified Communications Manager without physically placing a call?
- A. Cisco Unified Communications Manager Dialed Number Analyzer.
- B. Cisco Unified Communications Manager OS Administration.
- C. Cisco IOS Gateway debug commands.
- D. Cisco Unified Communications Manager RTMT trace output.
- E. base configuration information for this user that specifies Class of Restriction, Partition and Calling Search Space information
- F. Cisco Unified Communications Manager Serviceability tools
Correct Answer: A 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
LSC validation is failing on a new SCCP IP phone you have just added to the Cisco Unified CallManager 5.0 cluster. No other IP phones are experiencing any problems with LSC validation. What can you do to help pinpoint the problem?
- A. Check for security alarms.
- B. Use the security configuration menu on the IP phone to verify that an LSC has been downloaded to the IP phone.
- C. View the SDI trace output.
- D. Verify that the authentication string is correct in the Cisco Unified CallManager device configuration screen.
Correct Answer: B 🗳️
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
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