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Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Voice Gateway and Protocol Troubleshooting | - Media and codec issues
|
| Topic 2: QoS and Network Integration | - Voice quality issues
|
| Topic 3: Call Control and Dial Plan Troubleshooting | - Dial plan configuration issues
|
| Topic 4: Cisco Unified Communications Architecture Troubleshooting | - Cluster and server health issues
|
| Topic 5: Voicemail and Unified Messaging | - Cisco Unity Connection troubleshooting
|
| Topic 6: Endpoints and Registration Issues | - IP phone registration
|
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
DRAG DROP
Correct Answer:
Explanation:
The router or gateway matches these items in this order:
1.Called number (DNIS) with the incoming called-number command. First, the router or gateway attempts to match the called number of the call setup request with the configured incoming called-number of each dial peer. Because call setups always include DNIS information, it is recommended to use the incoming callednumber command for inbound dial peer matching
2.Calling Number (ANI) with the answer-address command If no match is found in step 1, the router or gateway attempts to match the calling number of the call setup request with the answer-address of each dial peer. This attribute can be useful in situations where you want to match calls based on the calling number (originating)
3.Calling Number (ANI) with the destination-pattern command If no match is found in step 2, the router or gateway attempts to match the calling number of the call setup request to the destination-pattern of each dial peer. For more information about this, see the first bullet in the Dial Peer Additional Information section of this document.
4.Originating Voice-port (associated with the incoming call setup request) with configured dial peer port ( applicable for inbound POTS call legs) If no match is found in the step 3, the router or gateway attempts to match the configured dial peer port to the voice-port associated with the incoming call. If multiple dial peers have the same port configured, the dial peer first added in the configuration is matched.
5.If no match is found in the first four steps, then the default dial peer 0 (pid:0)command is used. LINK: http://www.cisco.com/en/US/tech/tk652/tk90/technologies_tech_note09186a008010fed1.shtml
As a network technician, you should be familiar with RTCP. Which of the following statements best describes a function of RTCP?
- A. RTCP provides out-of-band control information for an RTP flow
- B. RTCP provides encryption, message authentication and integrity, and anti-replay service for voice streams.
- C. RTCP uses even-numbered UDP ports in the range 16,384??0?10?0?43??1?0?1C32,767 to transport voice payloads
- D. RTCP caches an RTP packet-Layer 3 and Layer 4 headers in the routers at each end of a link, resulting in lower bandwidth demand for subsequent RTP packets.
Correct Answer: A 🗳️
Echo is always present to some extent in all voice networks. For echo to be a problem, which three conditions must exist? (Choose three.)
- A. sufficient delay in echo return for echo to be perceived as annoying
- B. sufficient echo amplitude to be perceived as annoying
- C. analog leakage between analog Tx and Rx paths
- D. sufficient power from the talker's side to cause listener echo
- E. an analog two-wire to four-wire hybrid operating below 600 ohm impedance
Correct Answer: A,B,C 🗳️
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You are trying to register Media Gateway Control Protocol (MGCP) gateway with the Cisco CallManager version 3.0(5)a. To register, you execute the following commands:
mgcp
mgcp call-agent 192.168.10.1
ccm-manager mgcp
However, the MGCP gateway still does not register with the Cisco Call Manager. Which two steps should you perform next? (Choose two.)
- A. Use Cisco CallManager name instead of IP address.
- B. Verify the address for the Cisco CallManager.
- C. Reboot Cisco CallManager.
- D. Upgrade the Cisco CallManager version.
- E. Restart the MGCP gateway services.
- F. Run the ping command.
Correct Answer: B,F 🗳️
Upon completion of a failover task you notice that all the CTI devices are still pointing to the backup server rather than the primary server. How should you resolve this issue?
- A. Restart the subscriber with the CTI Manager Service on the secondary.
- B. Stop the CTI Manager Service on the Secondary server so that all devices using CTI register with the primary.
- C. Do nothing and wait for the next failover assuming this will revert back to the primary CTI server.
- D. Stop the CTI Manager Service on the Primary server so that all devices using CTI stay registered with the primary CTI server.
Correct Answer: B 🗳️
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