Which codecs should I choose for devices

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Revision as of 09:28, 18 January 2008 by Admin (talk | contribs) (New page: It depends. Most commonly used are: * G711 * G729 ==G711== PSTN quality codec which is supported in 99% of all devices/providers (but often disabled to save traffic). It has best qua...)
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It depends.

Most commonly used are:

  • G711
  • G729

G711

PSTN quality codec which is supported in 99% of all devices/providers (but often disabled to save traffic).

It has best quality but highest bandwidth (64kbps + ~20 kbps overhead ~= 84kbps to one direction).

It comes in 2 flavours - G711u (ulaw) - used in USA, and G711a (alaw) - used mostly in Europe and other countries.

G729

Little worse quality but is often used because it saves traffic (~8kbps + ~20kbps overhead ~= 28kbps to one direction).

It needs to be installed separately and it is not free.

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