Is there any documentation on the maximum number of simultaneous calls FreePBX can handle? I would imagine that factors such as bandwidth and the hardware specs on the server would have to be considered - is there a formula I can use to determine this?
Not a bad place to start
http://www.digium.com/blog/2012/09/25/asterisk-dimensioning-what-server-do-i-need/
note particularly this snippet
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Yes, the codecs used, transcoding required, recording or not, etc. will all affect the number of concurrent calls a given server will support – but you will not know the answers until you stop talking about it and go and actually do it!
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(I’m not sure I can agree with the 10000 and above claims, Top limit is IMHO pragmatically in the hundreds, not thousands of concurrent calls, further if you are looking at that sort of loading, likely there are better solutions for you than Asterisk which is a B2BUA)
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