Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
Certification Provider: Cisco
Corresponding Certification: CCNP Voice
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Cisco 642-427 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Call Setup and Dial Plan Troubleshooting | 25% | - Dial plan, route patterns, partitions, CSS, translation rules - Globalized call routing and number transformation - Intrasite, intersite, and off-net call failures |
| Topic 2: Integrated Solution Troubleshooting | 10% | - Unity Connection integration issues - Presence and IM service troubleshooting |
| Topic 3: CUCM and Registration Troubleshooting | 25% | - Endpoint and IP phone registration issues - Gateway and trunk registration (SIP, H.323, MGCP) - CUCM service availability and database replication |
| Topic 4: Troubleshooting Methodology and Tools | 20% | - Systematic troubleshooting approach - Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs |
| Topic 5: Advanced Features and Applications | 20% | - Call Control Discovery (CCD) and SAF - Extension Mobility Cross Cluster - Media resources, voice quality, and QoS issues |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Refer to the exhibits.
The gateway CSS for inbound calls is configured using internal. CSS, which contains all the directory number partitions for the phones. When a PSTN call that is destined for extension 2001 arrives at the MGCP gateway, the call falls. Use the debug and configuration information in the exhibits to determine what might be causing this issue?
- A. The MGCP gateway L3 timers need to be increased.
- B. The gateway is using partial PRI, which is not supported in MGCP mode.
- C. The backhaul link is not open.
- D. Incoming dial-peer configuration is needed.
- E. The hostname for the gateway does not match the configuration in Cisco Unified Communications Manager.
Correct Answer: A 🗳️
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How an H.323 gatekeeper can assume which bandwidth that will be required by a G.729 call?
- A. 24 kbps
- B. 64 kbps
- C. 16 kbps
- D. 8 kbps
Correct Answer: C 🗳️
Refer to the topology exhibit.
When the Cisco Unified Communications Manager at the BR1 site loses connectivity to the SAF network, the call to extension 3001 fails to reroute via the PSTN. Examine the SDI trace in the exhibit. What is the most likely cause of the failure?
- A. The Cisco Unified Communications Manager at the HQ site was unable to determine the ToDlD number to extension 3001.
- B. The calling phone line CSS does not have access to the V route pattern.
- C. The AAR CSS for the HQ phone does not have access to the \\ route pattern.
- D. The full E.164 number for extension 3001 could not be constructed.
- E. CCD requesting service does not have the correct partition configured for CCD learned patterns
Correct Answer: C 🗳️
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Which command should you use to resolve a jerky speed issue?
- A. echo-cancel enable
- B. comfort-echo
- C. playout-delay
- D. show voice port
- E. echo-cancel coverage
- F. comfort-noise
Correct Answer: C 🗳️
The following is a partial configuration of an access layer switch:
mls qos map cos-dscp 0 8 12 16 28 32 40 48
mls qos
!
Voice bearer traffic will be set to use which per-hop behavior?
- A. CS4
- B. EF
- C. AF12
- D. AF32
- E. BE
Correct Answer: A 🗳️
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