Cisco 642-425 : IP Telephony Troubleshooting

  • Exam Code: 642-425
  • Exam Name: IP Telephony Troubleshooting
  • Updated: Sep 04, 2026     Q & A: 54 Questions and Answers

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Cisco 642-425 Exam Syllabus Topics:

SectionObjectives
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
          Messaging and Collaboration Services- Unity Connection / voicemail issues
          • 1. Call forwarding and voicemail routing
            Voice Gateways and PSTN Integration- Gateway configuration issues
            • 1. ISDN and SIP trunk troubleshooting
              • 2. Dial peers and call routing
                IP Telephony Troubleshooting Methodology- Structured troubleshooting approaches
                • 1. Isolation techniques for voice issues
                  • 2. Analyzing call flow problems
                    VoIP Protocol Troubleshooting- Signaling protocols
                    • 1. SIP call flow analysis
                      • 2. SCCP call control issues
                        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. Branch site survivability troubleshooting
                              • 2. SRST activation and behavior
                                Quality of Service (QoS)- Voice quality issues
                                • 1. QoS policy verification
                                  • 2. Latency, jitter, and packet loss

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