Hi Dave, Down here in Brazil, the bandwidth costs is very high (around U$ 400.00/Mb) so it should be valid only for a "non" third world country. G729 and G723.1 is almost a law here, if you don't play at least with G729 your ITSP is out of mark share! My 2 cents from a third world country. Regards, Rodrigo Telles Em 23-01-2009 03:09, David Knell escreveu:
Steve Underwood wrote:
Depends what you are after. Speex offers the quality of G.729 at around the same processing load. However, nobody seems to want to pay for the processing load of G.729. Almost everything uses G.729A. Half the processing load, but significantly poorer quality.
VoIP is mostly a race to the bottom, and people wonder why it makes no money for provides. :-\
And, at the wholesale level, it makes no sense whatsoever to compress calls any more: bandwidth is so cheap (and has been for a while) that the loss in call quality - especially from tandem compressions - and the increased processing requirements and other bits of expense do not stack up. Case in point: we moved a route from G.711 to G.729, and saw the ACD drop from over 10 to under 7 minutes. It was a route to mobiles, so the audio was being recompressed with the GSM codec on its way to the handsets. Economically, had we carried on using G.729, we'd have lost about 30% of our margin on that route.
--Dave