Cisco 642-427 Exam Information and Actual Questions

  • Exam Code/Number: 642-427
  • Exam Name/Title: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
  • Certification Provider: Cisco
  • Corresponding Certification: CCNP Voice
  • Exam Questions: 301
  • Updated On: Jul 24, 2026

642-427
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642-427 Exam
Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)

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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
Real Exam Qty:45-55 (approx.)
Exam Duration:90-120
Exam Format:Multiple choice, Multiple answer, Drag and drop, Simulation / Troubleshooting scenarios
Related Certifications:CCNP Voice
CCNP Collaboration
CCNA Voice (legacy)
Exam Price:USD 250-300 (varies by region)
Passing Score:Variable (scaled score typically around 750/1000)
Certificate Validity Period:3 years (certification validity; legacy program)
Available Languages:English
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:

SectionObjectives
Topic 1: Endpoints and Registration Issues- Endpoint performance issues
  • 1. Device firmware and compatibility issues
    • 2. Phone registration failures
      - IP phone registration
      • 1. DHCP and TFTP configuration issues
        • 2. Device pool and load balancing problems
          Topic 2: Cisco Unified Communications Architecture Troubleshooting- Cluster and server health issues
          • 1. Publisher/subscriber synchronization issues
            • 2. Service activation and dependency problems
              - CUCM core components and services
              • 1. Database and service failure troubleshooting
                • 2. Call processing and call control analysis
                  Topic 3: Call Control and Dial Plan Troubleshooting- Dial plan configuration issues
                  • 1. Route patterns and translation patterns
                    • 2. Calling search space misconfiguration
                      - Call routing failures
                      • 1. SIP trunk and gateway routing issues
                        • 2. Intra-cluster and inter-cluster routing
                          Topic 4: Voicemail and Unified Messaging- Cisco Unity Connection troubleshooting
                          • 1. MWI (Message Waiting Indicator) failures
                            • 2. Call handler and routing rules issues
                              Topic 5: QoS and Network Integration- Voice quality issues
                              • 1. Jitter, latency, and packet loss analysis
                                • 2. QoS marking and prioritization problems
                                  Topic 6: Voice Gateway and Protocol Troubleshooting- Signaling protocols
                                  • 1. H.323 gateway troubleshooting
                                    • 2. MGCP gateway control problems
                                      • 3. SIP call setup and teardown issues
                                        - Media and codec issues
                                        • 1. RTP stream failures
                                          • 2. Codec mismatch and negotiation issues


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