Bytes per packet trasmitted by G.729

I am new to VOIP and doing self studying to learn. I ran into a question in the book that I can find the answers for the life of me. Could you provide the answers with a brief explanation so I can learn how you calculated the results.

Q1: What amount of bandwidth is consumed by the audio payload of G.729a?
A.      4.3 kbps
B.      6.3 kbps
C.      8 kbps
D.      16 kbps

Q2: How many bytes per packet are transmitted by G .729 assuming a 20-ms sample size?
A.      20
B.      40
C.      100
D.      120








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netcompAsked:
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Alex BaharCommented:
Q1. G729 payload consumes 8kbps
Q2. 20 bytes.
http://www.cliconnect.com/Articles/VoIPBandwidthRequirements.html 
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Jody LemoineNetwork ArchitectCommented:
Also consider that this is just the payload.  You have to factor in the IP and UDP overhead as well to get the overall packet size, which is always significantly greater than the payload itself.
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netcompAuthor Commented:
Perfect, I get it.

I have one last question in the same category that I would appreciate if you can look at. (below)
I will assign points shortly.

http://www.experts-exchange.com/Networking/Telecommunications/IP_Telephony/Asterisk_/Q_26420035.html
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