Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) : 642-427

642-427 real exams

Exam Code: 642-427

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

Updated: Aug 23, 2026

Q & A: 301 Questions and Answers

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Cisco 642-427 Exam Syllabus Topics:

SectionObjectives
Topic 1: Quality of Service and Voice Quality- Latency, jitter, and packet loss analysis
- Voice quality diagnostics
- QoS verification and troubleshooting
Topic 2: Cisco Unified Presence and Mobility- Mobility and extension mobility issues
- Presence service troubleshooting
Topic 3: Media Resources- Media Termination Points
- Music on Hold and annunciators
- Transcoders and conference bridges
Topic 4: Cisco Unity and Voice Applications- Voicemail integration issues
- Messaging service troubleshooting
Topic 5: Cisco Unified Communications Manager- Call processing issues
- Dial plan troubleshooting
- Device registration problems
Topic 6: IP Phones and Endpoints- Phone registration and provisioning
- Firmware and endpoint connectivity issues
Topic 7: Voice Gateways and Trunks- H.323 gateway troubleshooting
- PSTN connectivity issues
- SIP trunk troubleshooting
- MGCP gateway troubleshooting
Topic 8: Troubleshooting Methodology- Structured troubleshooting process
- Diagnostic tools and techniques
- Log and trace analysis

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

1. Refer to the Exhibit.

The Exhibit shows the output of an unsuccessful RSVP call setup that uses G.711 codec. Which configuration on serial 0/1/0.121 would resolve that issue?

A) ip rsvp bandwidth 96 96
B) ip rsvp bandwidth 40 40
C) ip rsvp bandwidth 40 24
D) ip rsvp bandwidth 96 80
E) ip rsvp bandwidth 80 16


2. You are configuring the Call Control Discovery feature. You need to configure Hosted DN Group Configuration settings. What is the range of values that you can define in the PSTN Failover Strip Digits field?

A) 0-12
B) 0-16
C) 0-14
D) 0-20
E) 0-10
F) 0-18


3. Refer to the exhibit.

Assume a centralized Cisco Unified Communications Manager topology. From the output of the show policy-map interface command, it can be seen that the voice traffic is experiencing drops. The router is configured for low latency queuing and is located at the central site. Which course of action would rectify this issue?

A) Configure a higher rate bandwidth codec on all voice calls
B) Configure Call Admission Control to limit the maximum calls that are sent to the priority queue.
C) Place the signaling traffic in the priority queue.
D) split some of the excess voice traffic into other queues K avoid oversubscription of the priority queue.


4. Refer to Exhibit.

When the user tried to configure the command maximum session 5 under the dspfarm profile 1, the error shown in the exhibit was reported. Which course of action will resolve this issue?

A) The Command dsp service dspfarm must be configured under the voice-card configuration.
B) Configure the dspfarm all command under the voice card.
C) Ensure that the conference bridge is not registered in Cisco Unified Communications Manager.
D) The maximum conference-participants value must be configured > 0.


5. Which three types of information are included in an alarm? (Choose three)

A) application name, machine name, and cluster name
B) an ordered list of locations to which an alarm was sent
C) application type, machine location, and cluster location
D) user-defined text that can be custom-defined
E) the list of alarms and alarm levels for each location to which the alarm is sent
F) explanation of event and recommended action


Solutions:

Question # 1
Answer: A
Question # 2
Answer: B
Question # 3
Answer: B
Question # 4
Answer: A
Question # 5
Answer: A,D,F

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