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

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Cisco 642-427 Exam Syllabus Topics:

Section	Objectives
Topic 1: Endpoints and Registration Issues	- Endpoint performance issues 1. Device firmware and compatibility issues 2. Phone registration failures - IP phone registration 1. Device pool and load balancing problems 2. DHCP and TFTP configuration issues
Topic 2: Voicemail and Unified Messaging	- Cisco Unity Connection troubleshooting 1. Call handler and routing rules issues 2. MWI (Message Waiting Indicator) failures
Topic 3: Voice Gateway and Protocol Troubleshooting	- Signaling protocols 1. SIP call setup and teardown issues 2. H.323 gateway troubleshooting 3. MGCP gateway control problems - Media and codec issues 1. Codec mismatch and negotiation issues 2. RTP stream failures
Topic 4: Cisco Unified Communications Architecture Troubleshooting	- CUCM core components and services 1. Database and service failure troubleshooting 2. Call processing and call control analysis - Cluster and server health issues 1. Publisher/subscriber synchronization issues 2. Service activation and dependency problems
Topic 5: QoS and Network Integration	- Voice quality issues 1. QoS marking and prioritization problems 2. Jitter, latency, and packet loss analysis
Topic 6: Call Control and Dial Plan Troubleshooting	- Call routing failures 1. SIP trunk and gateway routing issues 2. Intra-cluster and inter-cluster routing - Dial plan configuration issues 1. Calling search space misconfiguration 2. Route patterns and translation patterns

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

Question #1

How an H.323 gatekeeper can assume which bandwidth that will be required by a G.729 call?

A. 8 kbps
B. 24 kbps
C. 16 kbps
D. 64 kbps

Reveal Solution Discussion 0

Correct Answer: C 🗳️

Question #2

Which of the following describes SIP Early Offer?

A. In SIP Early Offer mode, the SDP media capabilities are sent in the INVITE message calling device.
B. In SIP Early Offer mode, the SDP media capabilities are sent in the 200 OK messages of the calling device.
C. In SIP Early Offer mode, the INVITE and the 200 OK messages use non-SDP message format to indicate SIP Early Offer
D. Early Offer always uses session indicator 183

Reveal Solution Discussion 0

Correct Answer: A 🗳️

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Question #3

You have received a trouble ticket stating that an executive with an account at a bank cannot retrieve account information by phone. When the executive calls the bank, the call is answered and the executive is prompted to enter the account code. However, the bank does not seem to recognize the DTMF tones and disconnects the call.
What is a possible solution to this problem?

A. Configure the progress_ind setup enable 3 command under the gateway VoIP dial peer.
B. Set the Cisco Unified CallManager service parameter ToSendH225UserInfoMsg to True.
C. Configure the voice rtp send-recv command in the gateway.
D. Configure the progress_ind alert enable 8 command under the gateway POTS dial peer.

Reveal Solution Discussion 0

Correct Answer: C 🗳️

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Question #4

Look at the following exhibit carefully.
You can click on the GK icon to view the output of the show gatekeeper endpoint command and click on each voice gateway to view the interface configuration. X of each popup can be clicked to back to the item.
As a network technician, you are recently responsible for configuring a gatekeeper with three local zones called East, West and EMEA. You have accomplished this task. In the East and EMEA zones, CallManager and the gateways are all registered in the West Zone, however, each of them should be registered in their own zone. In order to fix this issue, which measure should you take?

A. The zone name in the gateway command h323-gateway voip ID needs to be changed to the correct zone in both gateways.
B. The IP address in the gateway command h323-gateway voip ID needs to be changed to that of the individual gateways in both gateways.
C. The gatekeeper can only support one zone and all registering endpoints are being placed correctly in the first configured zone.
D. The gatekeeper needs to be stopped and restarted for the changes to take effect.

Reveal Solution Discussion 0

Correct Answer: A 🗳️

Question #5

Look at the following options carefully. Which two tasks are performed by the RAS signaling function of H.225.0? (Select two.)