No subject

is good for a couple hundred simultaneous calls.

With 4 'Intel(R) Xeon(TM) CPU 3.40GHz' cores, I can handle a couple 
hundred simultaneous non-transcoding calls with no recording on Asterisk 
1.2.

With 24 cores and 16 GB on tap, you will probably find other resource 
limitations before either CPU or RAM are a limiting factor.

Personally, I'm a 'don't put all your eggs in one basket' kind of guy.

Assuming a simplistic linear relationship between my host and yours, what 
will you do when it crashes with 1600 calls in progress? What will you do 
when you need to install patches or upgrade or ...

I like a couple of instances of OpenSIPS in front of several Asterisk 
instances, even if OpenSIPS is on the same boxes as Asterisk.

> What will be impact on no of session when G729a is used?

Significant.

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000