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Cisco Voice Over IP Sample Questions:

1. To hide its identity when initiating calls, Phone B requests that Server B place its calls for it. What kind of device is Server B?

A) redirect
B) proxy
C) user agent client
D) registrar
E) user agent server

2. You are working with a potential customer that would like to integrate its existing PBX telephone system into its IP network. The accompanying figure shows that the customer has two offices that need to be connected to the IP network so that the customer can exchange telephone calls without using the PSTN. Both PBXs use a proprietary signaling type.
Which signaling type will allow you to support your customer?

A) E&M
B) CCS
C) FXS
D) T-CCS
E) CAS
F) FXO

3. Which type of delay is caused when large data packets block voice packets from the outbound interface?

A) queuing delay
B) serialization delay
C) propagation delay
D) packetization delay

4. Which statement is true about only out-of-band signaling?

A) Signaling bits are sent in a special order in a dedicated signaling frame.
B) All signaling is directly associated with its corresponding voice frame.
C) A signaling bit is robbed from each frame.
D) All voice packets carry their own signaling.

5. LAB

Examine the following PBX system parameters:
The calling side seizes the line by going off-hook on its E-lead and sends information as DTMF digits.
The voice path is 4-wires, and the voice enabled router is in another building from the PBX.
Select the correct set of commands to allow communication between a voice enabled router and a PBX.

A) voice port 1/0/0 signal immediate-start operation 4-wire type 4
B) voice port 1/0/0 signal wink-start operation 4-wire type 3
C) voice port 1/0/0 signal immediate-start operation 4-wire type 2
D) voice-port 1/0/0 signal delay-dial operation 4-wire type 1

Solutions: