Cisco 642-437 : Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0)

  • Exam Code: 642-437
  • Exam Name: Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0)
  • Updated: Aug 31, 2026
  • Q & A: 257 Questions and Answers

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Cisco 642-437 Exam Syllabus Topics:

SectionObjectives
Topic 1: VoIP Fundamentals- Voice over IP basics
  • 1. Voice signaling protocols (H.323, SIP)
    • 2. VoIP components and operation
      Topic 2: Voice Gateways and Call Routing- Gateway implementation and configuration
      • 1. Dial peers and dial plan implementation
        • 2. Voice gateway interfaces and DSPs
          Topic 3: Cisco Unified Communications Manager Express- CUCME configuration
          • 1. Call handling and features
            • 2. Endpoint addressing and ephone setup
              Topic 4: Quality of Service (QoS)- QoS mechanisms
              • 1. AutoQoS and queuing
                • 2. DiffServ and classification
                  Topic 5: Troubleshooting- Troubleshooting voice and QoS issues
                  • 1. Diagnostics and show/debug commands
                    • 2. Common voice call issues
                      Topic 6: Cisco Unified Border Element (CUBE)- CUBE features and configuration
                      • 1. Media flow and protocol interworking
                        • 2. SIP trunks and interworking

                          Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:

                          Question 1

                          Which Cisco voice feature can you use to connect together two Session Initiation Protocol networks?

                          A. Cisco Unified Border Element
                          B. Cisco Transcoding
                          C. SIP gatekeeper
                          D. class of restriction


                          Question 2

                          Which codec supports VAD and CNG?

                          A. G.729B
                          B. G.726
                          C. G.723.1
                          D. G.711


                          Question 3

                          Which three Cisco IOS commands are required to configure a voice gateway as a DHCP server to support a data subnet with the IP address of 10.1.30.0/24 and a default gateway of 10.1.30.1/24? (Choose three.)

                          A. ip dhcp pool
                          B. ip dhcp pool data
                          C. subnet 10.1.30.1 255.255.255.0
                          D. network 10.1.30.1/24
                          E. default-router 10.1.30.1
                          F. default-gw 10.1.30.1/24
                          G. network 10.1.30.0 255.255.255.0


                          Question 4

                          Which proprietary voice client-server protocol sends traffic back to Cisco Unified Communications Manager with every digit pressed on the endpoint?

                          A. H.323 Protocol
                          B. Skinny Client Control Protocol
                          C. Session Initiation Protocol
                          D. Media Gateway Control Protocol


                          Question 5

                          Which types of voice ports allow a small office to provide outbound DNIS and inbound DID?

                          A. FXS-DID and FXO
                          B. FXO and E&M
                          C. FXS and E&M
                          D. FXS and FXO
                          E. FXS and FXS-DID


                          Solutions:

                          Question 1
                          Answer: A
                          Question 2
                          Answer: A
                          Question 3
                          Answer: B,E,G
                          Question 4
                          Answer: B
                          Question 5
                          Answer: A

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