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642-427
  • Exam Code: 642-427
  • Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
  • Updated: Sep 07, 2026
  • No. of Questions: 301 Questions and Answers
  • Download Limit: Unlimited
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Cisco 642-427 Exam Syllabus Topics:

SectionWeightObjectives
Topic 1: Integrated Solution Troubleshooting10%- Presence and IM service troubleshooting
- Unity Connection integration issues
Topic 2: Call Setup and Dial Plan Troubleshooting25%- Dial plan, route patterns, partitions, CSS, translation rules
- Intrasite, intersite, and off-net call failures
- Globalized call routing and number transformation
Topic 3: CUCM and Registration Troubleshooting25%- 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 Tools20%- Systematic troubleshooting approach
- Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs
Topic 5: Advanced Features and Applications20%- Call Control Discovery (CCD) and SAF
- Media resources, voice quality, and QoS issues
- Extension Mobility Cross Cluster

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

Question 1

Remote branch offices with Cisco IP Phones have just been implemented across a 2 Mb/s WAN link from your existing Cisco Unified Communications Manager cluster in headquarters. The WAN links are heavily utilized for data traffic. Users from the branch office report poor audio quality when they call the headquarters.
Which approach can you implement to directly improve audio quality in this scenario?

A. Implement CBWFQ.
B. Implement LLQ.
C. Implement TCP header compression.
D. Implement weighted random early detection.


Question 2

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


Question 3

You have a Cisco Unified Communications Manager cluster with four servers that are integrated with two Cisco Unity Connection servers and two Cisco Unified Contact Center Express servers. Some of the Cisco IP Phones are not implementing configuration changes that you assign to them.
Which troubleshooting approach can you implement to have the Cisco IP Phones accept all configuration changes?

A. Synchronize the database between the Publisher and the Subscriber of Cisco Unified Communications Manager.
B. Synchronize the database between Cisco Unified Contact Center Express and Cisco Unified Communications Manager.
C. Synchronize the databases in Cisco Unity Connection and Cisco Unified Contact Center Express.
D. Synchronize the database between Cisco Unity Connection and of Cisco Unified Communications Manager.


Question 4

Which type of echo is found mostly on tail circuits and is due to reflection that causes the Tx signal to appear on the Rx signal?

A. Hybrid echo
B. Listener echo
C. Tail-end echo
D. Talker echo


Question 5

In Cisco Unified Communications Manager (CUCM), the primary Service Advertisement Framework (SAF) forwarder is deleted from the database.
If there were total of three SAF forwarders configured, which two will happen next? (Choose two.)

A. The third SAF forwarder will become the primary SAF forwarder.
B. Through an election, the backup and the third SAF forwarder will be designated as primary SAF forwarder.
C. The backup SAF forwarder will automatically become the primary SAF forwarder.
D. You need to desinate the backup SAF forwarder as the primary SAF forwarder.
E. The third SAF forwarder will become the backup SAF forwarder.
F. CUCM will wait for the primary SAF forwarder to come alive.


Solutions:

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

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