This is our old Q&A Site. Please post any new questions and answers at

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

accept rate: 0%

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
Be the first one to answer this question!
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 15 Jul '14, 12:24

question was seen: 5,025 times

last updated: 15 Jul '14, 14:08

p​o​w​e​r​e​d by O​S​Q​A