[Asterisk-Users] g729 quality at GSM bitrates

[Chris Bagnall]

Greetings all,

I'm trying to improve the codec selection on a few of the asterisk boxes we
have to keep the g729 licences free for calls from ATAs that don't support
anything apart from g711 and g729. GSM seems to offer noticably inferior
call quality (at least when using a softphone + decent headphones), but it's
about where I want the bitrate to be.

I know there are lots of Speex options in codecs.conf - but has anyone done
some research to detemine at what bitrates and other settings Speex offers
comparable call quality with g729? Alternatively, has anyone done any
subjective comparisons between iLBC and Speex at various bitrates?

Regards,

Chris
-- 
C.M. Bagnall, Director, Minotaur I.T. Limited
This email is made from 100% recycled electrons