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Updated: Jul 15, 2026
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Cisco 642-427 Exam Overview:
| Certification Vendor: | Cisco |
| Exam Name: | Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) |
| Exam Number: | 642-427 |
| Real Exam Qty: | 55-65 |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple-choice, Multiple-answer, Simulation-based |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Exam Price: | USD 300 |
| Related Certifications: | CCNP Voice |
| Sample Questions: | Cisco 642-427 Sample Questions |
| Exam Way: | Proctored exam delivered at Pearson VUE testing centers. |
| Pre Condition: | Valid CCNA Voice or any active CCIE certification was required for the CCNP Voice certification path. |
| Official Syllabus URL: | https://learningnetwork.cisco.com/s/exam-topics |
Cisco 642-427 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Quality of Service and Voice Quality | - QoS verification and troubleshooting - Latency, jitter, and packet loss analysis - Voice quality diagnostics |
| IP Phones and Endpoints | - Firmware and endpoint connectivity issues - Phone registration and provisioning |
| Media Resources | - Music on Hold and annunciators - Media Termination Points - Transcoders and conference bridges |
| Voice Gateways and Trunks | - SIP trunk troubleshooting - H.323 gateway troubleshooting - MGCP gateway troubleshooting - PSTN connectivity issues |
| Cisco Unified Presence and Mobility | - Mobility and extension mobility issues - Presence service troubleshooting |
| Cisco Unity and Voice Applications | - Messaging service troubleshooting - Voicemail integration issues |
| Troubleshooting Methodology | - Structured troubleshooting process - Log and trace analysis - Diagnostic tools and techniques |
| Cisco Unified Communications Manager | - Dial plan troubleshooting - Call processing issues - Device registration problems |
Cisco Troubleshooting Cisco Unified Communications v8.0 (TVOICE v8.0) Sample Questions:
1. Refer to the Exhibit.
Assuming that the two Cisco SAF Forwarders are adjacent to each other and that no SAF clients have been configured, which statement is true?
A) The Cisco SAF Forwarders will establish a neighbor relationship. No further configuration is required.
B) The Cisco SAF Forwarders will not establish a neighbor relationship because the service-family external-client configuration is missing as well as the static neighbor configurations
C) Cisco SAF Forwarders will not establish a neighbor relationship until the SAF clients are configured and registered to the Cisco SAF Forwarders
D) The Cisco SAF Forwarders will not establish a neighbor relationship because the service-family external-client configuration is missing
E) The Cisco SAF Forwarders will not establish a neighbor relationship because the eigrp label CUCME should be replaced with SAF
2. Refer to the exhibit. A user is on a call to the PSTN through the MGCP gateway at BR1. The gateway and the IP phone lose the connection to the Cisco Unified CallManager cluster at HQ and the call is dropped. What is causing the call to be dropped?
A) The no h225 timeout keepalive command has not been configured on the gateway.
B) The CallManager cluster has lost control of the D channel on the PRI gateway at BR1.
C) SRST has not been configured on the BR1 gateway.
D) The IP phone has not registered with SRST.
3. Refer to the exhibit. You have received a trouble ticket stating that calls to international numbers are failing. To place an international call, users dial the access code "9," followed by "011," the country code, and the destination number. After entering the debug isdn q931 command on the MGCP gateway, you have the user attempt the call again.
Based on the debug output, what is the most likely cause of this problem?
A) Cisco Unified CallManager is not stripping the access code before sending the call to the gateway.
B) The TON is incorrect.
C) The user's CSS does not permit international calls.
D) The gateway dial peer needs to prefix "011" to the called number so the PSTN knows this is an international call.
E) The circuit is not configured correctly or has a physical layer issue.
4. Which RAS message does a gateway use to request admission to a network and to also request phone number to IP address resolution?
A) RRQ
B) ARQ
C) IRQ
D) LRQ
5. Which size is the jitter buffer of the Cisco MTP transcoder?
A) 45 - 60 ms
B) 25 - 50 ms
C) 10 - 30 ms
D) 20 - 40 ms
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: B | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: D |
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