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Cisco Voice Over IP Sample Questions:

1. A network has the following characteristics:
?the use of the G.711 codec with a codec speed of 64 kbps ?a 160-byte sample size
?the use of Frame Relay without compressed Real-Time Transport Protocol (CRTP)
?FRF.12 with 6 bytes of overhead
What minimum WAN bandwidth would be required to support three simultaneous VoIP calls?

A) 51600 bps
B) 79200 bps
C) 19200 bps
D) 247200 bps

2. You are meeting with a customer that has deployed IP telephony at their headquarters
location. They would like to roll out IP telephony to their regional office as well. They are now using the G.711 codec at headquarters. They want to be able to maximize the number of calls carried without impacting voice quality or forcing a WAN upgrade. Which codec would be appropriate for their WAN?

A) G.711
B) G.723.1
C) G.729B
D) G.726

3. The illustration above shows the timing and order of arrival of voice packets at the end device. Each voice packet contains 20 ms of voice data. Assuming a play-out buffer of 20 ms, what will happen to voice packet number 3?

A) It will be dropped and treated as a lost packet.
B) Immediately moved to the front of the play-out buffer.
C) It will be played out in its proper location.
D) It will be played out in the order it is received.

4. Examine the output.
ccm-manager mgcp ! mgcp 5036 ! voice-port 1/0/0 ! voice-port 1/0/1 ! dial-peer voice 1 pots application MGCPAPP port 1/0/0 !
dial-peer voice 2 pots application MGCPAPP port 1/0/1 !
Your customer has sent you their MGCP gateway configuration. They are unable to get the gateway to communicate with the call agent. What command needs to be inserted to resolve the problem?

A) mgcp 5036 172.16.1.1
B) mgcp call-agent 172.16.1.1
C) ccm-manager mgcp 172.16.1.1
D) application MGCPAPP 172.16.1.1

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

Solutions: