<br><br><div><span class="gmail_quote">On 2/8/07, <b class="gmail_sendername">Chris Icide</b> <<a href="mailto:chris@netgeeks.net">chris@netgeeks.net</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Steve Totaro wrote:<br>>><br>> How does average call length have anything to do with number of<br>> concurrent calls?<br>><br>Average call length doesn't affect concurrent calls directly, but does<br>affect the number of concurrent calls when you are trying to relate
<br>estimated concurrent calls from total number of users. However, I<br>suspect you already knew the answer to this question....</blockquote><div><br>Since its not clear I will also add call setup/teardown is generally more expensive than just bridging media. As such really low ALOCs can drive load up higher than longer ones for the same number of concurrent calls, which affects the overall number of channels you can process, effectively lowering the concurrent call capacity of a given box.
<br><br>Load balancing like with ser/openser can distribute this load, preserving higher channel counts on an individual box, and your total capacity as a hive. One of the advantages of seperating signalling from media, centralized routing and billing but distributed load across multiple boxes :)
<br><br>I am still wondering about the original 60,000 user claim, that can be revealed but the user base doesnt allow for concurrent calls per box to be revealed? <br><br>Anyway, even if its 200 calls per box as an average that still requires 30 boxes to accomplish a 1:10 use ratio at any given moment (not counting hot spares for spikes in load, failures, etc). Users vary greatly in phone usage, if its 60,000 "grandmas" who barely make calls you might see a 1:100 or even less call ratio, if its a telemarketer doing multiple concurrent calls it would be far worse perhaps upside down. "grandma" and a telemarketer are both 1 user each. 60,000 users without quantification of the user type is in my opinion a meaningless number.
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