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Updated: Sep 19, 2026
No. of Questions: 54 Questions & Answers with Testing Engine
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Cisco 642-425 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | IP Telephony Troubleshooting |
| Exam Number: | 642-425 |
| Exam Price: | $150 USD (retired) |
| Exam Format: | Multiple Choice, Simulations |
| Exam Duration: | 75-90 |
| Real Exam Qty: | 50-54 |
| Passing Score: | Approx. 750/1000 |
| Certificate Validity Period: | 3 years |
| Related Certifications: | CCNP Voice Cisco IP Communications |
| Available Languages: | English |
| Recommended Training: | Troubleshooting Cisco IP Telephony (IPTTR) v4.2 |
| Exam Registration: | Pearson VUE (Retired Exam) |
| Sample Questions: | Cisco 642-425 Sample Questions |
| Exam Way: | Computer-based testing at Pearson VUE centers |
| Pre Condition: | Recommended: CCNA Voice / CCNA Collaboration knowledge; retired since 2011 |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/retired.html |
Cisco 642-425 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Gateway & DSP Troubleshooting | 20% | - DSP resource allocation - Signaling protocol errors - Analog and digital gateway issues |
| Troubleshooting Methodology | 15% | - Using Cisco diagnostic tools - Systematic troubleshooting approach |
| CallManager & Unified CM Troubleshooting | 30% | - Service activation and failures - Call processing problems - Database replication issues |
| Signaling & Media Path Troubleshooting | 20% | - RTP stream and voice quality problems - H.323, SIP, MGCP protocol issues - Codec negotiation failures |
| IP Phone & Endpoint Troubleshooting | 15% | - VLAN and network connectivity - Phone registration and TFTP issues - Firmware and configuration download |
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