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Cisco Voice Over IP Sample Questions:

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

2. In the connection between a Cisco router and an E&M port on a PBX, which side is generally the Cisco side?

A) loop start
B) trunk circuit
C) signaling unit
D) switch port

3. In a VoIP environment when speech samples are framed every 20 ms, a payload of 20 bytes is generated. Assuming a total packet length of 60 bytes, what is the length of the packet header if cRTP is deployed without redundancy checks?

A) 4 bytes
B) 3 bytes
C) 2 bytes
D) 20 bytes
E) 40 bytes
F) 1 byte

4. Refer to the exhibit. What is the minimum WAN bandwidth required to support three simultaneous VoIP calls in this network?

A) 79,200 bps
B) 19,200 bps
C) 51,600 bps
D) 247,200 bps

5. Which three are supervisory signals? (Choose three.)

A) call waiting
B) busy
C) on hook
D) ring
E) off hook

Solutions: