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Codecs and Bandwidth

Introduction

Coded is the contraction of COder DECoder. It is the algorithm used for compressing voice traffic in order to limit its bandwidth consumption on a network. There are several types of codecs: the most common ones as well as their bandwidth are given in the table below:

Information

Codec family

Bandwidth

Comment

GIPS Family

13.3 Kbps and up


GSM

13 Kbps (full rate)


iLBC

15 Kbps, 20ms frame size: 13.3 Kbps, 30ms frame size


ITU G.711

64 Kbps, sample based

Also known as alaw/ulaw

ITU G.722

48/56/64 Kbps


ITU G.723.1

5.3, 6.3 Kbps


ITU G.726

16/24/32/40 Kbps


ITU G.728

16 Kbps


ITU G.729

8 Kbps, 10ms frame size


Speex

2.15 to 44.2 Kbps


LPC10

2.5 Kbps


DoD CELP

4.8 Kbps



Credits

The bandwidth indicated in the table above does not include packet header. In order to have total bandwidth, it is necessary to add the layer 2 and 3 bandwidth.

Edited for typos.. originally posted at http://en.wikipractice.org/wiki/Codec Content is available under GNU Free Documentation License 1.2.


Applies To

Asterisk

Keywords

codecs, Bandwidth



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