300-360 · Question #61
When reviewing a design for a voice over wireless deployment, what per-call bandwidth cost should be factored in when determining maximum calls per cell using SIP and G.711u as the codec?
The correct answer is C. 80 bytes. G.711u (ulaw) encodes audio at 64 Kbps. With a standard 10 ms packetization interval, each audio frame contains 64,000 bits/sec × 0.010 sec ÷ 8 = 80 bytes of payload. This 80-byte figure is the standard per-packet voice payload size used in capacity planning for G.711u VoWLAN…
Question
When reviewing a design for a voice over wireless deployment, what per-call bandwidth cost should be factored in when determining maximum calls per cell using SIP and G.711u as the codec?
Options
- A64 bytes
- B8 bytes
- C80 bytes
- D10 bytes
How the community answered
(63 responses)- A13% (8)
- B3% (2)
- C78% (49)
- D6% (4)
Explanation
G.711u (ulaw) encodes audio at 64 Kbps. With a standard 10 ms packetization interval, each audio frame contains 64,000 bits/sec × 0.010 sec ÷ 8 = 80 bytes of payload. This 80-byte figure is the standard per-packet voice payload size used in capacity planning for G.711u VoWLAN deployments. It is used alongside header overhead (IP + UDP + RTP = ~40 bytes) to calculate total per-call bandwidth consumption and thus the maximum concurrent calls supportable per cell.
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