[Freeswitch-users] Is there any license G729?

[Rupa Schomaker]

And unless you are directly connecting to the cell phone provider you are
going to be converted to ULAW/ALAW to traverse the PSTN.  So there is no
advantage going to a native GSM codec only to have it expanded out to G711
and then back to GSM codec.

On Tue, Jun 30, 2009 at 10:05 PM, Steve Underwood <steveu at coppice.org>wrote:

> Edmar Cruz wrote:
> > So what codec supports mobile phones?
> >
> The main codecs used by mobile phones are:
>    GSM FR        The original GSM code, largely replaced by later
> codecs (some VoIP stuff uses this)
>    GSM HR        The half rate codec for GSM
>    GSM EFR      A later improved full rate codec that largely replaced
> GSM FR on GSM networks
>    AMR-NB        The current start of the art narrowband codec for GSM
> and UMTS networks
>    AMR-WB        The wide band codec for UMTS, though most networks
> seem to block it
>    EVRC            The main codec for the CDMA networks
>
> Each of these codecs sounds pretty respectable, and G.729 sounds pretty
> respectable. However, if you transcode from one to another the result
> can be pretty bad.
>
> Steve
>
>
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-- 
-Rupa
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