- Exam Code: 642-437
- Exam Name: Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0)
- Updated: Sep 17, 2026
- Q & A: 257 Questions and Answers
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) : 642-437
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Cisco 642-437 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Quality of Service (QoS) | - QoS mechanisms
|
| Topic 2: Troubleshooting | - Troubleshooting voice and QoS issues
|
| Topic 3: Cisco Unified Communications Manager Express | - CUCME configuration
|
| Topic 4: VoIP Fundamentals | - Voice over IP basics
|
| Topic 5: Voice Gateways and Call Routing | - Gateway implementation and configuration
|
| Topic 6: Cisco Unified Border Element (CUBE) | - CUBE features and configuration
|
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
Question #1
Which two commands should you use on a common gateway between the two IP telephony networks to enable SIP to H.323 interworking? (Choose two.)
- A. allow-connections sip to h323
- B. voice service h323 to sip
- C. allow-connections h323 to sip
- D. voice service sip to h323
Correct Answer: A,C 🗳️
Question #2
Which media resource requires hardware digital signal processors?
- A. conference bridge
- B. transcoding
- C. music on hold
- D. annunciator
Correct Answer: B 🗳️
Question #3
What is the prerequisite for configuring Cisco AutoQoS VoIP on a Cisco catalyst switch?
- A. Configure Cisco Express Forwarding.
- B. Cisco Discovery Protocol version 2.
- C. Configure trust boundaries.
- D. Configure correct bandwidth on all interfaces.
- E. Configure the mls qos global configuration command.
Correct Answer: B 🗳️
Question #4
DRAG DROP
The voice gateway selects an inbound VoIP dial peer by matching the information elements in the setup message with the dial peer attributes. From the list on the left, drag the elements to the right and drop them in the order in which a voice gateway matches inbound calls. Not all options are used.
Correct Answer:
Explanation:
Inbound Dial Peers Matching Process
When the Cisco IOS router or gateway receives a call setup request, a dial peer match is made for
the incoming call in order to facilitate routing the call to different session applications. This is not a
digit-by-digit match; rather the full digit string received in the setup request is used to match
against configured dial peers. The router or gateway matches the information elements in the
setup message with the dial peer attributes to select an inbound dial peer. The router or gateway
matches these items in this order:
Called number (DNIS) with the incoming called-number command:
First, the router or gateway attempts to match the called number of the call setup request with the
configured incoming called-number of each dial peer. Because call setups always include DNIS
information, it is recommended to use the incoming called-number command for inbound dial peer
matching. This attribute has matching priority over the answer-address and destination-pattern
commands.
Calling Number (ANI) with the answer-address command:
If no match is found in step 1, the router or gateway attempts to match the calling number of the
call setup request with the answer-address of each dial peer. This attribute can be useful in
situations where you want to match calls based on the calling number (originating).
Calling Number (ANI) with the destination-pattern command:
If no match is found in step 2, the router or gateway attempts to match the calling number of the
call setup request to the destination-pattern of each dial peer. For more information about this, see
the first bullet in the Dial Peer Additional Information section of this document.
Voice-port (associated with the incoming call setup request) with configured dial peer port
(applicable for inbound POTS call legs):
If no match is found in the step 3, the router or gateway attempts to match the configured dial peer
port to the voice-port associated with the incoming call. If multiple dial peers have the same port
configured, the dial peer first added in the configuration is matched.
If no match is found in the first four steps, then the default dial peer 0 command is used.
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Question #5
What is the reason that a call succeeds when COR is applied to the incoming dial peer and is equal to or greater than the COR settings that are applied to the outgoing dial peer?
- A. The COR list for incoming calls on the incoming dial peer is a superset of COR lists for outgoing calls on the outgoing dial peer.
- B. The outgoing dial peer, by default, has the lowest priority.
- C. COR lists for incoming calls on the incoming dial peer are not a superset of COR lists for outgoing calls on the outgoing dial peer.
- D. The incoming dial peer, by default, has the highest COR priority when no COR is applied.
Correct Answer: A 🗳️
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