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Cisco Voice Over IP Sample Questions:

1. Which gateway interface connects to the standard station port of a PBX?

A) FXO
B) FXS
C) POTS
D) E&M

2. In E1 CAS, where are framing and signaling states carried?

A) 6th and 12th frame
B) the first and seventeenth time slot
C) the first and sixteenth time slot
D) 6th, 12th, 18th, and 24th frame

3. You are working with your customer in their lab to test the effect of jitter on voice quality. You have set the maximum playout delay to 40 ms on the voice enabled routers. What will be the impact on voice quality if after severe congestion the playout buffer empties and the source sends packets to the buffer faster than they are leaving?

A) The jitter buffer will speed up delivery of packets to the DSP so that packets are not dropped.
B) After the jitter buffer fills up, subsequent packets are discarded.
C) There will be no noticeable drop in quality.
D) The jitter buffer will adapt to the faster-arriving packets by expanding the buffer size.

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

5. Which two codecs are required on a Gateway to support CNG and VAD across a WAN link without major impact to call quality and bandwidth consumption? (Choose two.)

A) G.723
B) G.729a
C) G.729b
D) G.729
E) G.729ab

Solutions: