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

  • Exam Code: 642-427
  • Exam Name: Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0)
  • Updated: Jun 14, 2026
  • Q&As: 301 Questions and Answers

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642-427 exam dumps

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

1. In Cisco Unity Connection (CUC), you notice that the recordings do not have any sound. You need to correct this problem. What should you do?

A) Enable automatic gain control (AGC).
B) Correct the advertised codec settings.
C) Restart the transcoder.
D) Restart the gateway.
E) Change the port group settings.
F) Change the audio level for sniffer captures.


2. Your manager requires that users who call PSTN phones from Cisco IP Phones in a Cisco Unified Communications Manager cluster have the single caller ID of 13125551000 for the entire company.
Which approach achieves this goal?

A) Create a route pattern in Cisco Unified Communications Manager of 13125551000.
B) Change the external phone number mask on all phones to 13125551000.
C) Create a VoIP dial peer to Cisco Unified Communications Manager with the destination pattern of 13125551000.
D) Configure the gatekeeper to change the caller number to 13125551000.


3. Which two commands can be used to troubleshoot transcoding issues on a Cisco IOS voice gateway? (Choose two.)

A) show ip interface brief
B) debug h245 asn1
C) show voiceport summary
D) show SCCP
E) show running-config | include dspfarm
F) debug h225 asn1
G) debug no logging voice


4. 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) AF32
C) AF12
D) BE
E) EF


5. A company has migrated to a Cisco Unified CallManager IP Telephony system and is now replacing the existing voice-mail system with a Cisco Unity voice-mail system. A small group of users has been established to test the new voice mail system. The users were able to initialize their mailboxes and record greetings; however, during testing the callers were sometimes unable to leave voice-mail messages for Cisco Unity users.
Which two issues could cause this problem? (Choose two.)

A) There is a mismatch in the number of ports configured in Cisco Unified CallManager and Cisco Unity.
B) The call transfer call handlers are not configured correctly.
C) Cisco Unity is in a G.729 region and has not been configured to support G.729.
D) The hunt group is hunting to Cisco Unity ports that have been dedicated for message notification.
E) There is a mismatch in the MWI on/off numbers configured in Cisco Unified CallManager and Cisco Unity.


Solutions:

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

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