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Updated: Aug 18, 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 |
| Available Languages: | English, Japanese |
| Related Certifications: | CCNP Voice |
| Exam Price: | USD 300 |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 55-65 |
| Certificate Validity Period: | 3 years |
| Exam Format: | Multiple-choice, Multiple-answer, Simulation-based |
| 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 |
|---|---|
| Topic 1: Voice Gateways and Trunks | - H.323 gateway troubleshooting - MGCP gateway troubleshooting - SIP trunk troubleshooting - PSTN connectivity issues |
| Topic 2: Quality of Service and Voice Quality | - Latency, jitter, and packet loss analysis - QoS verification and troubleshooting - Voice quality diagnostics |
| Topic 3: Cisco Unified Presence and Mobility | - Mobility and extension mobility issues - Presence service troubleshooting |
| Topic 4: Troubleshooting Methodology | - Log and trace analysis - Diagnostic tools and techniques - Structured troubleshooting process |
| Topic 5: Cisco Unity and Voice Applications | - Messaging service troubleshooting - Voicemail integration issues |
| Topic 6: Cisco Unified Communications Manager | - Device registration problems - Dial plan troubleshooting - Call processing issues |
| Topic 7: Media Resources | - Music on Hold and annunciators - Media Termination Points - Transcoders and conference bridges |
| Topic 8: IP Phones and Endpoints | - Firmware and endpoint connectivity issues - Phone registration and provisioning |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
1. Which two issues can cause a Cisco Unified Communications Manager to fail to register with its Cisco SAF Forwarder? (Choose two.)
A) CCD requesting service was not activated.
B) Incorrect user credentials were used on the SAF Forwarder.
C) An H.323 SAF trunk was configured instead of a SIP SAF trunk.
D) CCD advertising service was not activated.
E) No directory number patterns were configured on the Cisco Unified Communications Manager.
2. 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) Use dejitter buffers
C) Prioritize voice packets
D) Increase bandwidth
3. Which information can be used to troubleshoot dropped calls?
A) Cisco Discovery Protocol neighbor output
B) Call Manager traces
C) system logs
D) switch port configurations
4. Before a SAF client begins to forward, publish, subscribe, and update service data, with which option must it establish a relationship?
A) SAF domains
B) SAF service identifier
C) SAF forwarder
D) SAF Cisco Unified Communications Manager
5. Which Cisco Unified Communications Manager troubleshooting tool can be used to look at detailed specific events, such as dial plan digit analysis, as they die happening?
A) syslog output
B) traceroutes
C) RTMT performance log viewer
D) Cisco Unified Communications Manager alerts
E) RTMT real-time trace
F) Cisco Unified Dialed Number Analyzer
Solutions:
| Question # 1 Answer: A,B | Question # 2 Answer: A,C,D | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: E |
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