[Asterisk-Users] G729 vs. gsm

[Steve Underwood]

steve at daviesfam.org wrote:

>On Sun, 29 May 2005, Steve Underwood wrote:
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>>It isn't a one way scale. Music on hold over G.729 is often 
>>unrecognisable. Over GSM 06.10 it is usually just poor. Is that a big 
>>issue for you, or totally irrelevant? GSM 06.10 and G.729 at 8kbps offer 
>>fairly similar quality for clean voice. GSM wins when there is 
>>background noise. G.729 wins on bit rate.
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>One nice feature of GSM is that people are used to the way it sounds from 
>their cellphones, they mentally tune the distortions out.
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Very few GSM phones/networks use the 06.10 codec any more. Its all 
half-rate, EFR and AMR these days. I think only phones more than 5 years 
old, or ancient cell sites, will be using 06.10, although all current 
phones still support it for compatibility.

Regards,
Steve