Cisco 642-425 : IP Telephony Troubleshooting

642-425 real exams

Exam Code: 642-425

Exam Name: IP Telephony Troubleshooting

Updated: Sep 06, 2026

Q & A: 54 Questions and Answers

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Cisco 642-425 Exam Syllabus Topics:

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

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                                      IP Telephony Troubleshooting

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