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Cisco CCNP Voice 642-427

642-427

Exam Code: 642-427

Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)

Updated: Nov 05, 2026

Q & A: 301 Questions and Answers

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Cisco 642-427 Exam Syllabus Topics:

SectionWeightObjectives
Troubleshooting Methodology and Tools20%- Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs
- Systematic troubleshooting approach
Integrated Solution Troubleshooting10%- Presence and IM service troubleshooting
- Unity Connection integration issues
CUCM and Registration Troubleshooting25%- Gateway and trunk registration (SIP, H.323, MGCP)
- CUCM service availability and database replication
- Endpoint and IP phone registration issues
Call Setup and Dial Plan Troubleshooting25%- Globalized call routing and number transformation
- Intrasite, intersite, and off-net call failures
- Dial plan, route patterns, partitions, CSS, translation rules
Advanced Features and Applications20%- Extension Mobility Cross Cluster
- Call Control Discovery (CCD) and SAF
- Media resources, voice quality, and QoS issues

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

Question #1
HOTSPOT


Question #2
Look at the following exhibit carefully.
You can click the Voice Gateway for the BR2 location to see the output from the debug voice ccapi inout command and click on 10.1.5.10 to see and search the trace file output. You can also enter a string in the Search box and click the Find button to search the output. X can be clicked to back to the item.
As a network technician, you have recently configured a trunk between the Cisco Unified CallManager cluster at 10.1.5.10 and a CME at a 10.3.130.1. In the testing of this configuration, you discover that you can complete calls when dialing from ext.2020 to ext.4001, however, a fast busy can only be received when dialing from ext.4001 to ext.2020.
Please choose the most possible reason of this issue from the following statements.

A. A CSS has been omitted from the trunk configured to BR2.
B. An incorrect CSS has been applied to the gateway at HQ.
C. The h323-gateway voip bind srcaddr 10.3.130.1 command has been omitted from the BR2 configuration.
D. A transaction rule has been applied that is keeping the call from being completed.


Question #3
Refer to the exhibit. When Alice, at extension 2001, places a call to 3001, she hears her own voice. Which two letters representing areas on the exhibit are the most likely source of the echo? (Choose two.)

A. A
B. C
C. B
D. D
E. E


Question #4
Which of these is a correct definition of "Alert"?
Select the best response.

A. an event that can be configured to send information to multiple destinations, each of which has its own alert event level
B. an event that provides the current view and history of SDI/SDL messages, information from which is stored by Cisco Unified CallManager in an SQL server database
C. an event, either a preconfigured or user-defined, that provides the current status and history of events in the Cisco Unified CallManager cluster
D. an event that provides the run-time status of a system, notifications when problems have occurred, and sometimes problem resolution


Question #5
You have received a trouble ticket stating that the MWI light is not coming on for a group of users. Further investigation reveals that the affected users are connected to the same subscriber in the cluster. Users that are connected to other subscribers in the same cluster are not experiencing this issue.
What is causing this problem?

A. Database replication has an error or has failed.
B. The Cisco Unity voice-mail services need to be restarted for the subscriber so all the users will receive proper MWI message indication.
C. The MWI numbers for this subscriber have been changed.
D. The voice-mail ports assigned to the subscriber are down.


Solutions:

Question #1
Correct Answer: Only visible for members
Question #2
Correct Answer: C
Question #3
Correct Answer: D,E
Question #4
Correct Answer: C
Question #5
Correct Answer: A

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