Cisco 642-432 : Cisco Voice Over IP
- Exam Code: 642-432
- Exam Name: Cisco Voice Over IP
- Updated: Sep 18, 2026
- Q & A: 72 Questions and Answers
About Cisco 642-432 Exam
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Cisco 642-432 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Integrating Voice over IP into the PSTN | - PSTN Integration
|
| Topic 2: Voice over IP Technologies | - Voice over IP Technologies
|
| Topic 3: Voice over IP Configuration | - Voice over IP Configuration
|
| Topic 4: Integrating Voice over IP into Existing PBX Networks | - PBX Integration
|
| Topic 5: Call Operation and Components in Voice over IP | - Call Operation and Components
|
Cisco Voice Over IP Sample Questions:
Which process changes an internal extension into a fully qualified external PSTN number before matching to a dial peer?
- A. number expansion
- B. prefix extension
- C. forward digits
- D. digit masking
Correct Answer: A 🗳️
You have a customer that is interested in determining the number of VoIP calls their Frame Relay WAN links can support. Each of their Frame Relay WAN links has 84 kbps of bandwidth available outside all other applications and overhead. How many G.729 calls using the 8 kbps codec and 20 byte sample size can be supported?
- A. 1
- B. 2
- C. 4
- D. 3
Correct Answer: D 🗳️
Refer to the exhibit. What is the minimum WAN bandwidth required to support three simultaneous VoIP calls in this network?
- A. 247,200 bps
- B. 19,200 bps
- C. 79,200 bps
- D. 51,600 bps
Correct Answer: C 🗳️
What is the E.164 numbering plan?
- A. the IETF North American number plan
- B. the ITU worldwide number plan
- C. the European PBX standard telephony number plan
- D. a proprietary PBX number plan
Correct Answer: B 🗳️
Given the SIP network shown in the diagram, identify which two actions are initiated by the UAS (user agent server)? (Choose two.)
- A. originates the ACK method to indicate that it has received a response to an invitation
- B. contacts the user when a SIP invitation is received
- C. originates the BYE method to initiate call termination
- D. originates the INVITE method including a description of the session parameters
- E. returns a response on behalf of the user to the invitation originator
Correct Answer: B,E 🗳️
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