On Sun, 10 Jun 2007, Khaled Chehab wrote:
I have question concerns asterisk
1-What is difference between G.729 and G.729A?
The letter A.
http://en.wikipedia.org/wiki/G.729
... says that G279A uses slightly less CPU to do the compression at the
expense of sound quality. Digium appear to supply G279 rather than G729A.
(at least they don't mention A)
2-How can I know the requirement hardware for 150 extension on asterisk
1.4.4 making 50 simultaneous call?
Google or search the voip-wiki for asterisk scaling, etc. However these
days you don't really have much choice - it's a 2.8-3.4GHz
Pentium/something or a 1.8-3GHz Xeon/something, or a 3GHz AMD/something.
(and their dual/quad processor versions)
Basically any modern "server" class box will do for your needs unless
you're transcoding every call. A 3GHz processor and 1GB or RAM will be
fine - but you need to be careful with other issues - like making sure
disk IO (if doing a lot of call recording/voicemail) won't interfere with
Ethernet/Zap/TelcoInterface traffic...
I know that 50 simulataneous calls will work fine on a 1GHz processor as
long as you're not transcoding.
Also, see this:
http://www.digium.com/en/products/voice/g729codec.php
where they have done some tests themselves and mention the transcoding
numbers vs. CPU speed.
3-Do asterisk have a codec conversion?
Asterisk will transcode between different codecs, if the codecs are
compiled in, or licensed (g729) but transcoding comes at a big CPU cost.
Gordon
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