How to know the max concurrent calls that my server can support?????

Dear All,
Now if i have many kind of sip servers or pbx , how to say that this can can handle 300 call at the same time , say i have elastix ,opensips and another opensips in another location
what is the test i do that give me the sure result , this machine can do like 1000 call same time
i ope u get my point ?
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It will depend greatly on what the server is having to do.
If all you are doing is passing calls between extensions then the number of active calls is almost unlimited as the server isnt doing anything during the call other than keeping a record of it in memory. In this case the only work the server does is in establishing the call.
However if different codecs are being used then asterisk will have to convert the audio on the fly and this will use up some cpu.
If you are using E1/T1 PRI interface cards then using ones with built in echo cancelation will help significantly.
Anything like call recording and meetme conferences will have a much greater impact on the servers performance.

So the first step is to identify exactly what advanced services the server is going to support.
Then work out what limitations would be acceptable such as forcing everyone to use the same codec.
Then you can get an idea on how many calls the server will be able to support.

With regard to opensips it doesnt perform any advanced call features. It basically just handles the authentication and call routing and therefore typically can handle thousands of simultaneous calls on even a fairly basic specification new server.
To add some simple math to grblades excellent post, when calculating call recording, assume 1 call (2 channels) consumes the resources of 2 calls. If codecs are being used, then multiply by two again, (4 calls).

So, a server that is processing 400 straight calls as a max, can only support 200 if calls are being re order, and only 100 if calls are being recorded AND codecs are in use (transcoding).

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