[Freeswitch-users] Is there any license G729?

Steve Underwood steveu at coppice.org
Tue Jun 30 20:05:20 PDT 2009


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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