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Cisco 642-427 : 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: Sep 28, 2026
Q & A: 301 Questions and Answers
642-427 Free Demo download
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Cisco 642-427 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Integrated Solution Troubleshooting | 10% | - Presence and IM service troubleshooting - Unity Connection integration issues |
| Topic 2: CUCM and Registration Troubleshooting | 25% | - CUCM service availability and database replication - Gateway and trunk registration (SIP, H.323, MGCP) - Endpoint and IP phone registration issues |
| Topic 3: Advanced Features and Applications | 20% | - Extension Mobility Cross Cluster - Call Control Discovery (CCD) and SAF - Media resources, voice quality, and QoS issues |
| Topic 4: Call Setup and Dial Plan Troubleshooting | 25% | - Intrasite, intersite, and off-net call failures - Dial plan, route patterns, partitions, CSS, translation rules - Globalized call routing and number transformation |
| Topic 5: Troubleshooting Methodology and Tools | 20% | - Systematic troubleshooting approach - Monitoring and diagnostic tools: RTMT, Serviceability, traces, logs, debugs |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
Question #1
When a database replication issue is suspected, which three tools can be used to check the database replication status? (Choose three.)
- A. Cisco Unified OS Administration interface
- B. Cisco Unified Reporting
- C. Cisco Unified Communications Manager RTMT tool
- D. Cisco IP Phone Device Stats from the Settings button
- E. Cisco Unified Communications Manager Serviceability interface
- F. Cisco Unified Communications Manager CLI interface
Correct Answer: B,C,F 🗳️
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Question #2
Which three Cisco IOS commands are required to configure a voice gateway as a DHCP server to support a data subnet with the IP address of 101.30.0/24 default gateway of 10.1.30.1/24? (Choose three)
- A. default-router 10.1.30.1
- B. network 10.1.30.0 255.255.255.0
- C. default-gw 10.1.30.1.24
- D. network 10.1.30.1/24
- E. ip dhcp pool
- F. subnet 10.1.30.1 255.255.255.0
- G. ip dhcp pool data
Correct Answer: A,B,G 🗳️
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Question #3
You have configured an ISR at a branch office to register as an Enhanced IOS media resource providing transcoding services. The transcoder has not been placed into a media resource group. Which statement best describes which devices will be able to utilize this transcoder?
- A. Only devices that have not been assigned an MRGL will be able to utilize the transcoder.
- B. No devices will be able to utilize the transcoder until it is placed in a media resource group.
- C. All devices will be able to utilize the transcoder.
- D. Only devices configured to use G.729 will be able to utilize the transcoder.
- E. Only devices at the branch office will be able to utilize the transcoder.
Correct Answer: C 🗳️
Question #4
You have placed all DNs in the Phones partition. During testing you discover that you cannot place calls between IP phones, but you can place calls to the PSTN and voice mail. What is one possible cause of this issue?
- A. The IP phones have not been assigned a CSS.
- B. An access list is blocking SCCP packets in your voice VLAN.
- C. A database replication issue is preventing calls between phones.
- D. An access list is blocking RTP streams in your voice VLAN.
Correct Answer: A 🗳️
Question #5
Cisco CallManager 5.0 has just been deployed in two locations across a wide-area link. A distributed model with an intercluster trunk has been used. When you call an IP phone at the remote site the phone rings, but as soon as the other person picks up the phone, the call is dropped.
Where should you look to diagnose the problem?
- A. system parameters
- B. locations
- C. Cisco Unified CallManager group
- D. Cisco Unified CallManager CTI traces
- E. media resource group
Correct Answer: E 🗳️
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