Cisco 642-425 : IP Telephony Troubleshooting

  • Exam Code: 642-425
  • Exam Name: IP Telephony Troubleshooting
  • Updated: Aug 30, 2026
  • Q & A: 54 Questions and Answers

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Cisco 642-425 Exam Syllabus Topics:

SectionObjectives
Topic 1: IP Telephony Troubleshooting Methodology- Structured troubleshooting approaches
  • 1. Isolation techniques for voice issues
    • 2. Analyzing call flow problems
      Topic 2: IP Phone and Endpoint Issues- IP phone registration and connectivity
      • 1. SCCP and SIP endpoint behavior
        • 2. DHCP, TFTP, and configuration files
          Topic 3: Cisco Unified Communications Manager (CUCM) Troubleshooting- Dial plan troubleshooting
          • 1. Route patterns and translation patterns
            • 2. Partitions and calling search spaces
              - Call processing issues
              • 1. Device registration problems
                • 2. Call routing failures
                  Topic 4: Quality of Service (QoS)- Voice quality issues
                  • 1. QoS policy verification
                    • 2. Latency, jitter, and packet loss
                      Topic 5: Voice Gateways and PSTN Integration- Gateway configuration issues
                      • 1. ISDN and SIP trunk troubleshooting
                        • 2. Dial peers and call routing
                          Topic 6: Survivable Remote Site Telephony (SRST)- Failover scenarios
                          • 1. SRST activation and behavior
                            • 2. Branch site survivability troubleshooting
                              Topic 7: VoIP Protocol Troubleshooting- Signaling protocols
                              • 1. SCCP call control issues
                                • 2. SIP call flow analysis
                                  Topic 8: Messaging and Collaboration Services- Unity Connection / voicemail issues
                                  • 1. Call forwarding and voicemail routing

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