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Video calls using 384 kbps need to be supported across a gatekeeper-controlled trunk. What value should be entered into the gatekeeper to support this bandwidth?
A. 768 kbps
B. 384 kbps
C. 512 kbps
D. 192 kbps
Answer: B
Explanation:
A 384-kb/s video call may comprise G.711 at 64 kb/s (for audio) plus 320 kb/s (for video).
This sum does not include overhead. If the audio codec for a video call is G.729 (at 24 kb/s), the video rate increases to maintain a total bandwidth of 384 kb/s.
The bandwidth that is assumed by the gatekeeper for each call is twice the bandwidth of the audio codec. A G.729 call is configured for 16 kbps, and a G.711 call is configured for 128 kbps. This is not the actual bandwidth seen on the wire, but it’s the standard used when configuring gatekeeper CAC to represent a call. Multiple calls are simply calculated as an even multiple of these numbers, 16 and 128. Therefore, it is critical to
know which codec is being used when configuring gatekeeper CAC.