Cisco 642-432 : Cisco Voice Over IP

  • Exam Code: 642-432
  • Exam Name: Cisco Voice Over IP
  • Updated: Sep 09, 2026   Q&As: 72 Questions and Answers

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Cisco 642-432 Exam Syllabus Topics:
SectionObjectives
Cisco Unified Communications Architecture- CUCM (Cisco Unified Communications Manager) fundamentals
  • 1. System components and architecture overview
    • 2. Device pools, regions, and locations
      - Call processing design
      • 1. Digit manipulation and translation patterns
        • 2. Call routing logic and dial plan concepts
          IP Phone Deployment and Features- Advanced telephony features
          • 1. Conference and transfer services
            • 2. Call forwarding and hunt groups
              - Endpoint registration and configuration
              • 1. Cisco IP phone registration process
                • 2. Device configuration templates
                  Quality of Service (QoS) for Voice- Voice traffic prioritization
                  • 1. Latency, jitter, and packet loss considerations
                    • 2. QoS marking and classification (DSCP)
                      Call Control and Survivability- Redundancy and high availability
                      • 1. CallManager redundancy mechanisms
                        - SRST (Survivable Remote Site Telephony)
                        • 1. SRST configuration and failover behavior
                          Voice Gateway and Protocol Integration- PSTN integration
                          • 1. Dial peers and call legs
                            • 2. Voice gateways configuration concepts
                              - VoIP signaling protocols
                              • 1. SIP fundamentals
                                • 2. H.323 call setup and interoperability
                                  Cisco Voice Over IP Sample Questions:
                                  Question #1

                                  Which option is true concerning the MGCP call agent?

                                  • A. manages all aspects of the call and voice stream
                                  • B. monitors the quality of each call after setup
                                  • C. acts only as a recorder of call details
                                  • D. provides only call signaling and call setup
                                  Answer: D
                                  Question #2

                                  DRAG DROP
                                  Drop

                                  Answer:

                                  Question #3

                                  You have set up a complex dial plan using translation rules. The following translation rule has been configured. What output would correspond to the test translation-rule command?
                                  translation-rule 1 rule 0 ^0.. 215550210 rule 1 ^1.. 215550211 rule 2 ^2.. 215550212 rule 3 ^3.. 215550213 rule 4 ^4.. 215550214 rule 5 ^5.. 215550215 rule 6 ^6.. 215550216 rule 7 ^7.. 215550217 rule 8 ^8.. 215550218 rule 9 ^9.. 215550210

                                  • A. test translation-rule 1 555 The replaced number: 55521555021
                                  • B. test translation-rule 1 617 The replaced number: 61721555021
                                  • C. test translation-rule 1 910 The replaced number: 21555021910
                                  • D. test translation-rule 1 512 The replaced number: 21555021512
                                  Answer: D
                                  Question #4

                                  Which statement is true about only out-of-band signaling?

                                  • A. All voice packets carry their own signaling.
                                  • B. Signaling bits are sent in a special order in a dedicated signaling frame.
                                  • C. All signaling is directly associated with its corresponding voice frame.
                                  • D. A signaling bit is robbed from each frame.
                                  Answer: B
                                  Question #5

                                  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
                                  Answer: D

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