Cisco 642-425 : IP Telephony Troubleshooting

  • Exam Code: 642-425
  • Exam Name: IP Telephony Troubleshooting
  • Updated: Aug 02, 2026
  • Q & A: 54 Questions and Answers

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Cisco 642-425 Exam Syllabus Topics:

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

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