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Cisco 642-437 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Implement QoS for Voice Networks | 15% | - Queuing mechanisms and AutoQoS - Classification, marking, and policing - QoS principles and requirements - Call Admission Control |
| Topic 2: Describe VoIP Call Legs and Signaling | 20% | - H.323, SIP, and MGCP protocols - Codec selection and media transport - VoIP architecture and call flow |
| Topic 3: Describe a Dial Plan | 13% | - Call routing and PSTN connectivity - Dial plan components and functions - Digit manipulation and route patterns |
| Topic 4: Implement Voice Gateways | 22% | - Gateway types and deployment models - Dial peers configuration - Analog and digital voice ports - Fax and modem support |
| Topic 5: Implement Gatekeeper and Cisco Unified Border Element | 12% | - Gatekeeper functions and configuration - CUBE deployment and features - Interoperability and security |
| Topic 6: Implement Cisco Unified Communications Manager Express | 18% | - IP phone registration and provisioning - Basic call features and dial plans - CUCME setup and configuration |
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
Calls are failing to egress the local PSTN gateway that uses an E1 PRI circuit. Which debug command would be most useful in determining which dialed digits are being sent to the PSTN?
- A. debug voice dial-peer
- B. debug isdn q931
- C. debug isdn q921
- D. ccapi inout
Correct Answer: B 🗳️
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Dial peers and gateways are important in the call routing process. The call routing process is done based on the inbound dial-peer and outbound dial-peer matching process. Which two statements are true? (Choose two.)
- A. When a Cisco router or gateway receives a call setup request, a digit-by-digit match is used to match against configured dial peers.
- B. Cisco platforms such as the Cisco AS53xx and AS5800 Series require that a configured inbound dial peer is matched for incoming POTS calls to be accepted as voice calls.
- C. Dial peer 0 for inbound POTS peers has a "no ivr application" configuration.
- D. In order to modify the default interdigit timeout set for 10 seconds, issue this command. interdigit timeouts # seconds voice-port.
Correct Answer: B,C 🗳️
Which command should you use to configure a dial-peer to support T.38 fax relay and to use Cisco fax relay if T.38 fails?
- A. fax relay t38 backup cisco relay
- B. fax relay t38 cisco
- C. fax t38 fallback cisco
- D. fax protocol t38 fallback cisco
Correct Answer: D 🗳️
At what point in a VoIP network are the existing class of service or differentiated services code point values considered valid and are used throughout the rest of the network?
- A. marking boundary
- B. distribution layer
- C. access layer
- D. trust boundary
Correct Answer: D 🗳️
A call is received on a voice gateway from a Session Initiation Protocol-based Internet source. The call is destined for a telephone that is connected directly to the gateway. Which type of dial-peer is considered outgoing?
- A. VoIP
- B. Foreign Exchange Station
- C. plain old telephone service
- D. Foreign Exchange Office
Correct Answer: C 🗳️
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