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Cisco 642-437 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Implement Voice Gateways | 22% | - Fax and modem support - Dial peers configuration - Analog and digital voice ports - Gateway types and deployment models |
| Implement Cisco Unified Communications Manager Express | 18% | - Basic call features and dial plans - CUCME setup and configuration - IP phone registration and provisioning |
| Implement QoS for Voice Networks | 15% | - Call Admission Control - Queuing mechanisms and AutoQoS - QoS principles and requirements - Classification, marking, and policing |
| Implement Gatekeeper and Cisco Unified Border Element | 12% | - Gatekeeper functions and configuration - CUBE deployment and features - Interoperability and security |
| Describe VoIP Call Legs and Signaling | 20% | - VoIP architecture and call flow - H.323, SIP, and MGCP protocols - Codec selection and media transport |
| Describe a Dial Plan | 13% | - Call routing and PSTN connectivity - Digit manipulation and route patterns - Dial plan components and functions |
Cisco Implementing Cisco Unified Communications Voice over IP and QoS v8.0 (CVOICE v8.0) Sample Questions:
Which three features are embedded in an RTP header? (Choose three.)
- A. bandwidth type
- B. time stamp
- C. sequence number
- D. DSP
- E. packet size
- F. payload type
The router with the IP address of 10.1.120.1 needs to be configured to use the device 10.1.140.1 as the clock source. Which configuration command will accomplish this task?
- A. ntp source ip addr 10.1.140.1
- B. clock source 10.1.140.1
- C. clock set 10.1.140.1
- D. ntp server 10.1.140.1
- E. ntp client 10.1.120.1 server 10.1.140.1
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What is a Cisco Voice Gateway feature that enables class of service or calling privileges to be assigned?
- A. calling search space
- B. dial peer
- C. partition
- D. COR
You have a Cisco Unified Border Element configured to provide H.323 to SIP interworking. Which command will verify that you have a single H.323 and a single SIP call leg when the call is placed?
- A. debug voip ipipgw
- B. show dialpeer voice
- C. debug voice dialpeer
- D. show call active voice
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DRAG DROP
Drag the delay type on the left and drop it on the correct description on the right.
Explanation:
Processing Delay: Coder delay is the time taken by the digital signal processor (DSP) to compress a block of PCM samples. This is also called processing delay (n). This delay varies with the voice coder used and processor speed. Serialization Delay: Serialization delay (n) is the fixed delay required to clock a voice or data frame onto the network interface. It is directly related to the clock rate on the trunk. Dejitter Buffer: Because speech is a constant bit-rate service, the jitter from all the variable delays must be removed before the signal leaves the network. In Cisco router/gateways this is accomplished with a de-jitter (n) buffer at the far-end (receiving) router/gateway. The de-jitter buffer transforms the variable delay into a fixed delay. It holds the first sample received for a period of time before it plays it out. This holding period is known as the initial play out delay. DSP Delay: The time the packet spends inside the DSP is known as DSP Delay. Sampling, Encoding, Decoding etc. takes place inside the DSP. Queuing Delay: After the compressed voice payload is built, a header is added and the frame is queued for transmission on the network connection. Voice needs to have absolute priority in the router/gateway. Therefore, a voice frame must only wait for either a data frame that already plays out, or for other voice frames ahead of it. Essentially the voice frame waits for the serialization delay of any preceding frames in the output queue. Queuing delay (Bn) is a variable delay and is dependent on the trunk speed and the state of the queue. There are random elements associated with the queuing delay. Propagation Delay: Caused by the length a signal must travel via light in fiber or electrical impulse in copper-based networks
http://www.cisco.com/en/US/tech/tk652/tk698/technologies_white_paper09186a00800a8993.shtml
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