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Updated: Jul 28, 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 |
| Certificate Validity Period: | 3 years |
| Exam Price: | USD 250-300 |
| Exam Duration: | 90-120 |
| Related Certifications: | CCNP Collaboration (Legacy) Cisco Certified Specialist |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple Choice, Drag-and-Drop, Simulation |
| Passing Score: | 825 / 1000 |
| Real Exam Qty: | 30-70 |
| Recommended Training: | Official Cisco Training: Troubleshooting Cisco Unified Communications v8.0 (TVOICE) |
| Exam Registration: | Pearson VUE Registration |
| Sample Questions: | Cisco 642-427 Sample Questions |
| Exam Way: | Onsite at Pearson VUE test centers / Online proctored |
| Pre Condition: | No mandatory prerequisites; recommended knowledge of CVOICE, IPT1, IPT2 and CUCM administration |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/tvoice.html |
Cisco 642-427 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Call Setup and Dial Plan Troubleshooting | 25% | - Intrasite, intersite, and off-net call failures - Dial plan, route patterns, partitions, CSS, translation rules - Globalized call routing and number transformation |
| Advanced Features and Applications | 20% | - Call Control Discovery (CCD) and SAF - Media resources, voice quality, and QoS issues - Extension Mobility Cross Cluster |
| Troubleshooting Methodology and Tools | 20% | - Systematic troubleshooting approach - Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs |
| Integrated Solution Troubleshooting | 10% | - Presence and IM service troubleshooting - Unity Connection integration issues |
| CUCM and Registration Troubleshooting | 25% | - CUCM service availability and database replication - Endpoint and IP phone registration issues - Gateway and trunk registration (SIP, H.323, MGCP) |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
1. Refer to the exhibit.
When calling 911, which gateway/route list is defined in the route pattern in Cisco Unified Communications Manager and used to route matched digits to the PSTN?
A) RouteListCdrc
B) SEP002290BA361B
C) BRANCH
D) standardLocalRG
E) LRG_RL
F) nodeld = 1
2. Please choose the location of RAI configuration from the following options.
A) On a gateway
B) On a Cisco Unified Communications Manager server
C) On both a gatekeeper and a gateway
D) On a gatekeeper
3. While you troubleshoot an issue with audio quality, the symptoms stop.
Which troubleshooting step is next?
A) Document the facts.
B) Continue to gather all the facts about the situation.
C) Finalize the definition of the problem.
D) Finalize the observation of the results.
4. You are trying to register Media Gateway Control Protocol (MGCP) gateway with the Cisco CallManager version 3.0(5)a. To register, you execute the following commands:
mgcp
mgcp call-agent 192.168.10.1
ccm-manager mgcp
However, the MGCP gateway still does not register with the Cisco Call Manager. Which two steps should you perform next? (Choose two.)
A) Upgrade the Cisco CallManager version.
B) Restart the MGCP gateway services.
C) Use Cisco CallManager name instead of IP address.
D) Run the ping command.
E) Reboot Cisco CallManager.
F) Verify the address for the Cisco CallManager.
5. If you need to avoid choppy speech, what is the maximum tolerable round-trip delay between two VoIP endpoints?
A) 100 ms
B) 300 ms
C) 500 ms
D) 800 ms
E) 400 ms
F) 200 ms
Solutions:
| Question # 1 Answer: E | Question # 2 Answer: A | Question # 3 Answer: B | Question # 4 Answer: D,F | Question # 5 Answer: B |
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