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By observing a VoIP connection I realized that the payload size is varying size. When the value is 60 is a comfort noise, when the value is 74 has voice. But what if the value is 66? alt text

asked 15 Jul '14, 12:24

julius's gravatar image

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You'd probably need to read the g.729 specification to find out.

(15 Jul '14, 12:58) Anders ♦

Anders i read the rfc but it says that the payload can be 10 20 30 40 bytes.

(15 Jul '14, 13:07) julius

The sizes in the codec specs (which G.729 is) are usually the codec payload size, not including the headers for RTP, UDP, IP, etc. Also, are you sure it isn't specifying 10/20/30/40 packetization audio sample size (i.e., ptime in milliseconds, instead of encoded packet length)?

(15 Jul '14, 14:06) Hadriel
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question asked: 15 Jul '14, 12:24

question was seen: 4,964 times

last updated: 15 Jul '14, 14:08

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