Cisco IP Telephony Troubleshooting : 642-425

642-425 real exams

Exam Code: 642-425

Exam Name: IP Telephony Troubleshooting

Updated: Aug 27, 2026

Q & A: 54 Questions and Answers

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Cisco 642-425 Exam Syllabus Topics:

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

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