Try Cisco : 642-427 valid & accurate questions and answers
Updated: Sep 14, 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 Price: | USD 250-300 (varies by region) |
| Exam Duration: | 90-120 |
| Certificate Validity Period: | 3 years (certification validity; legacy program) |
| Exam Format: | Multiple choice, Multiple answer, Drag and drop, Simulation / Troubleshooting scenarios |
| Available Languages: | English |
| Real Exam Qty: | 45-55 (approx.) |
| Passing Score: | Variable (scaled score typically around 750/1000) |
| Related Certifications: | CCNP Collaboration CCNP Voice CCNA Voice (legacy) |
| Recommended Training: | Cisco Unified Communications Troubleshooting Training (legacy CCNP Voice curriculum) Cisco Learning Network - Collaboration Training |
| Exam Registration: | Cisco Certification Overview Cisco Certification Registration (Pearson VUE) |
| Sample Questions: | Cisco 642-427 Sample Questions |
| Exam Way: | Computer-based exam delivered via Pearson VUE testing centers or online proctored delivery (where available) |
| Pre Condition: | Recommended: CCNA Voice or equivalent knowledge of Cisco Unified Communications systems |
| Official Syllabus URL: | https://learningnetwork.cisco.com/s/certification |
Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| QoS and Network Integration | - Voice quality issues
|
| Cisco Unified Communications Architecture Troubleshooting | - CUCM core components and services
|
| Voicemail and Unified Messaging | - Cisco Unity Connection troubleshooting
|
| Call Control and Dial Plan Troubleshooting | - Call routing failures
|
| Voice Gateway and Protocol Troubleshooting | - Signaling protocols
|
| Endpoints and Registration Issues | - IP phone registration
|
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Which replication state means that the replication is good?
- A. 1
- B. 3
- C. 4
- D. 2
Correct Answer: D 🗳️
Refer to the exhibit. The BR phones can only support G.711 codec. When a call is placed from a BR phone to an HQ phone, the call fails. The message "not enough bandwidth" is displayed at the BR phone. Which change would resolve this issue?
- A. Change the location setting to 104.
- B. Change the location setting to 48.
- C. Change the location setting to 80.
- D. Change the location setting to 160.
- E. Change the location setting to 28.
Correct Answer: C 🗳️
Users are making calls from Cisco IP Phones that are registered on a Cisco Unified Communications Manager cluster through an H.323 gateway to the PSTN phones. Sometimes these users report that calls are dropped after they have talked for some time. Different Cisco Unified CM servers have been rebooted for testing during production hours. Currently Cisco IOS
12.0 is used on the H.323 gateway.
Which change helps to prevent calls from dropping when a Cisco Unified CM server is rebooted during testing?
- A. A misconfiguration of calling search spaces must exist. Reconfigure the CSS.
- B. There is no scenario where rebooting an H.323 gateway will allow call survivability.
- C. A misconfiguration of VoIP dial peers to the Cicso Unified CM servers must exist. Reconfigure the VoIP dial peers.
- D. Upgrade the gateway Cisco IOS software to a version later than 12.4(4)9T.
Correct Answer: D 🗳️
Refer to the exhibit. You have received a trouble ticket that two engineers at the HQ site tried to conference at a user location at the Branch site and the ad-hoc conference failed.
Further investigation reveals that the remote user can occasionally be conferenced in. Phones are configured to use G.711 for intra-site calls and G.729 for inter-site calls. All phones at the remote site are configured to use MRGL_Branch, which contains only the media resource group named BRANCH.
What should be done to correct this issue?
- A. Additional hardware conference resources should be added.
- B. The number of sessions allowed per conference should be increased.
- C. The hardware conference bridge CFB0012005FEEF1 should be listed first in the Branch media resource group so it is utilized if it is available.
- D. The software conference bridge CFB_2 should be removed from the Branch media resource group.
Correct Answer: D 🗳️
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As a network administrator, you should be familiar with various commands. Which command can be used to enable a SIP user agent on a Cisco router?
- A. No special command is required. SIP is on by default.
- B. sip-ua dial-peer configuration mode subcommand
- C. sip-ua global configuration mode command
- D. sip-ua interface configuration mode subcommand
Correct Answer: C 🗳️
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