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Updated: Sep 19, 2026
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Cisco 642-437 Exam Overview:
| Certification Vendor: | Cisco |
|---|---|
| Exam Name: | Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) |
| Exam Number: | 642-437 |
| Exam Price: | USD 300 |
| Certificate Validity Period: | 3 years |
| Real Exam Qty: | 60-70 |
| Available Languages: | English, Japanese |
| Passing Score: | Not publicly disclosed / Approximately 750-800 out of 1000 |
| Related Certifications: | CCNA Voice CCIE Collaboration |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple Choice Multiple Answer, Simulation, Multiple Choice Single Answer, Drag and Drop |
| Recommended Training: | Implementing Cisco Unified Communications Voice over IP and QoS v8.0 |
| Exam Registration: | Cisco Exam Page Pearson VUE Registration |
| Sample Questions: | Cisco 642-437 Sample Questions |
| Exam Way: | Onsite at Pearson VUE test centers; no online proctoring available |
| Pre Condition: | Valid CCNA Voice certification or equivalent knowledge; CCIE certification also satisfies eligibility |
| Official Syllabus URL: | https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/642-437-cvoice.html |
Cisco 642-437 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Implement Cisco Unified Communications Manager Express | 18% | - IP phone registration and provisioning - CUCME setup and configuration - Basic call features and dial plans |
| Implement Gatekeeper and Cisco Unified Border Element | 12% | - Gatekeeper functions and configuration - Interoperability and security - CUBE deployment and features |
| Describe a Dial Plan | 13% | - Call routing and PSTN connectivity - Dial plan components and functions - Digit manipulation and route patterns |
| Implement Voice Gateways | 22% | - Fax and modem support - Dial peers configuration - Gateway types and deployment models - Analog and digital voice ports |
| Implement QoS for Voice Networks | 15% | - Classification, marking, and policing - QoS principles and requirements - Queuing mechanisms and AutoQoS - Call Admission Control |
| Describe VoIP Call Legs and Signaling | 20% | - Codec selection and media transport - H.323, SIP, and MGCP protocols - VoIP architecture and call flow |
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
What is the maximum percentage of packet loss that can be accepted on VoIP traffic?
- A. less than 1%
- B. less than 5%
- C. less than 2%
- D. 0
Correct Answer: A 🗳️
Refer to the exhibit.
How does a switch port that receives marked traffic from a Cisco IP phone use the mls qos trust cos command?
- A. For non-IP packets, the CoS is set to 7 and DSCP-to-CoS mapping is not applied.
- B. The DSCP-to-CoS map is applied.
- C. The CoS setting is modified according to the CoS-to-DSCP map.
- D. CoS is used to select the ingress and egress queues.
Correct Answer: C 🗳️
Which command allows verification of RSVP configuration?
- A. show ip interface detail
- B. show ip rsvp installed detailed
- C. show ip rsvp interface
- D. show ip rsvp policy
Correct Answer: C 🗳️
Which command correctly enables a trust of the existing differentiated services code point value coming into a switch?
- A. switch(config-mls)#dscp trust
- B. switch(config-mls)#mls qos trust dscp
- C. switch(config-if)#mls dscp trust
- D. switch(config-if)#mls qos trust dscp
Correct Answer: D 🗳️
What is the function of TEHO in a path selection strategy?
- A. Uses the WAN link for call routing to avoid PSTN charges.
- B. Allows users to place an intersite call by dialing a site code.
- C. Uses the WAN link for call routing to avoid PSTN charges; in addition, the PSTN breakout should be as close as possible to the final PSTN destination.
- D. Defines each site with a unique site code.
Correct Answer: C 🗳️
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