asterisk users - Oct 2003 - what is the best codec for low bandwidth? for quality?

The number of codecs is overwhelming to me.

What do ya'll consider the best codec for conserving bandwidth? [I realize
at the cost of quality]

Secondly, what do you think the best codec for voice quality is?

Yours,
Matthew

GSM is fairly low bandwidth and sounds pretty good. G711 (ulaw/alaw) is
by far the best, you can send faxes with it (and if I am not mistaken
Ilbic)


> -----Original Message-----
> From: asterisk-users-admin@lists.digium.com [mailto:asterisk-users-
> admin@lists.digium.com] On Behalf Of Matthew Simpson
> Sent: Thursday, October 23, 2003 12:30 AM
> To: asterisk-users@lists.digium.com
> Subject: [Asterisk-Users] what is the best codec for low bandwidth?
for
> quality?
> 
> The number of codecs is overwhelming to me.
> 
> What do ya'll consider the best codec for conserving bandwidth? [I
realize
> at the cost of quality]
> 
> Secondly, what do you think the best codec for voice quality is?
> 
> Yours,
> Matthew
> 
> _______________________________________________
> Asterisk-Users mailing list
> Asterisk-Users@lists.digium.com
> http://lists.digium.com/mailman/listinfo/asterisk-users

> GSM is fairly low bandwidth and sounds pretty good. G711 (ulaw/alaw) is
> by far the best, you can send faxes with it (and if I am not mistaken
> Ilbic)
My preferred codec is ILBC.  Open-source, pretty low bitrate and excellent 
MOS.  GSM is second for me, and then after that just ulaw/alaw.

Regards,
Andrew

Matthew Simpson wrote:
>The number of codecs is overwhelming to me.
>
>What do ya'll consider the best codec for conserving bandwidth? [I
realize
>at the cost of quality]
>
>Secondly, what do you think the best codec for voice quality is?
>
>Yours,
>Matthew
>  
>
Its hard to tell you which codec is best becasue it depends on what 
phone you are using..

For quality, G.711 (ulaw or alaw) is king but at 64K (+-85K on the wire) 
its very FAT..

For lowest bandwidth..
If you are using a Grandstream then your only option is G.711 (alam or 
ulaw)..
If you are using a Snom then GSM is th one to use..
X-Lite and X-Pro have support for GSM, iLBC and Speex, GSM works fine, I 
can't get iLBC to work with Asterisk and I have never tried Speex..

If you are interconnecting Asterisk servers with IAX/2 then the choice 
is yours.. My personal choice is iLBC but GSM is a good option as well..

If you want to pay for licenses, G.729 will give you a lower bandwidth 
use than even iLBC and can be used by most phones..

Later..

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