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Cisco 642-427 Exam Syllabus Topics:

SectionObjectives
Topic 1: Endpoints and Registration Issues- IP phone registration
  • 1. Device pool and load balancing problems
    • 2. DHCP and TFTP configuration issues
      - Endpoint performance issues
      • 1. Device firmware and compatibility issues
        • 2. Phone registration failures
          Topic 2: Call Control and Dial Plan Troubleshooting- Call routing failures
          • 1. SIP trunk and gateway routing issues
            • 2. Intra-cluster and inter-cluster routing
              - Dial plan configuration issues
              • 1. Route patterns and translation patterns
                • 2. Calling search space misconfiguration
                  Topic 3: Cisco Unified Communications Architecture Troubleshooting- Cluster and server health issues
                  • 1. Publisher/subscriber synchronization issues
                    • 2. Service activation and dependency problems
                      - CUCM core components and services
                      • 1. Call processing and call control analysis
                        • 2. Database and service failure troubleshooting
                          Topic 4: Voicemail and Unified Messaging- Cisco Unity Connection troubleshooting
                          • 1. Call handler and routing rules issues
                            • 2. MWI (Message Waiting Indicator) failures
                              Topic 5: Voice Gateway and Protocol Troubleshooting- Signaling protocols
                              • 1. H.323 gateway troubleshooting
                                • 2. SIP call setup and teardown issues
                                  • 3. MGCP gateway control problems
                                    - Media and codec issues
                                    • 1. RTP stream failures
                                      • 2. Codec mismatch and negotiation issues
                                        Topic 6: QoS and Network Integration- Voice quality issues
                                        • 1. Jitter, latency, and packet loss analysis
                                          • 2. QoS marking and prioritization problems

                                            Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:

                                            Question 1

                                            Refer to the exhibits.

                                            End-to-end RSVP with local RSVP fallback has been configured on the HO Cisco Unified Communications Manager. RSVP between the locations that are assigned to the IP phones and SIP trunk at the HQ site is configured as mandatory. When a call is placed from an HQ phone to a BR phone, the end-to-end RSVP request fails.

                                            Refer to the SDI trace. Which statement about the call is true?

                                            A. The Cisco Unified Communications Manager at HO will use end to end RSVP. The BR Cisco Unified Communications Manager will use local RSVP.
                                            B. The call will proceed as a normal call with no RSVP reservation.
                                            C. The Cisco Unified Communications Manager at HO will fall back to local RSVP and place the call No RSVP end-to-end will occur.
                                            D. Only local RSVP will take place at both the HQ and BR Cisco Unified Communications Managers.
                                            E. The call will fail.


                                            Question 2

                                            Headquarters reports that some users can call each other but other users cannot call each other.
                                            Which two troubleshooting tools can isolate why some users cannot call each other in headquarters? (Choose two.)

                                            A. DNA
                                            B. Cisco Unified Communications Manager trace
                                            C. debug SCCP on the gateway
                                            D. debug voice dialpeer inout on the gateway


                                            Question 3

                                            A second H.323 gateway has been added to headquarters with a Cisco Unified Communications Manager cluster. Outbound dialing for long-distance numbers works consistently through the first
                                            H.323 gateway, but it is never routed through the second gateway. When the first gateway is shut down, no long-distance dialing works.
                                            Which change is needed to use both H.323 gateways for long-distance dialing?

                                            A. Remove the route list and route groups. Add both gateways to the existing route pattern for long-distance dialing.
                                            B. Remove the existing route pattern for long-distance dialing. Create a translation pattern for long-distance dialing and configure it to work with both H.323 gateways.
                                            C. Configure the existing route pattern to a route list and a route group. Add both H.323 gateways to the route group.
                                            D. Add a second route pattern, the same as the first route pattern, to the second gateway.


                                            Question 4

                                            Refer to the exhibit.

                                            Which configuration is the correct Cisco IOS configuration that corresponds to the Cisco SAF Forwarder that is shown in the exhibit?

                                            A. Exhibit C
                                            B. Exhibit A
                                            C. Exhibit B
                                            D. Exhibit D


                                            Question 5

                                            When parsing trace output after the call routing decision and path selection have been made, which two records can be found in the CCM|RouteList? (Choose two.)

                                            A. RouteListCdrc
                                            B. CallingPartyNumber
                                            C. PretransfromDigitString
                                            D. RouteListName
                                            E. PretransformCallingPartyNumber
                                            F. findLocalDevice


                                            Solutions:

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

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