On Sat, May 17, 2008 at 3:11 PM, Mike Trest - On Travel <[EMAIL PROTECTED]> wrote: > At 11:44 AM 5/16/2008, you wrote: >>Yes, you could probably add 2 or 3 or 10 or 15 to the number of calls >>that a particular machine could handle, but from a support perspective, it >>doesn't matter how many the machine could theoretically handle, it matters >>how many it could handle in the particular installation in a supportable >>configuration (those are all those pesky variables we've been talking about). > > Absolutely! Right On! Tell it like it is! And many other > cryptic encouragements. > > With very large scale deployments, I have a set of numbers available > in my head > that work well to predict how many machines will be needed for a > particular application > but I wind up being surprised by non-predictable "rate of arrival" issues. > > Since most of my deployments are tied with Television and other promotional > support, a single reference by the on-screen (or on-radio) commentator, and > the > phones are instantly flooded with thousands of new call setup > requests. Indeed, > one such incident in a NASCAR race with 13M viewers, produced 18,000 new calls > within two minutes. The rate of arrival of new calls was dispersed > to a farm of 60 > Asterisk in three widely separated regions of the > US. However, approximately > 15,000 calls were actually dropped on the PSTN / SS7 network before > ever reaching > three dispersed Asterisk farms. > > Those farms were being "fed" inbound calls by a network of > 250+ Nortel switches with > millions of subscribers. However, the Los Angeles area PSTN network > access facility > had only 900 spare channels available in that two minute > period. Meanwhile, every asterisk > answered every call and joint the callers into appropriate conference > groups until every > single available port was fully occupied. This illustrates that > such issues of call capacity > exist completely apart from the Asterisk or whatever machine is used > for implementation. > > So everyone should not be surprised by "it depends" kinds of answers > to the question > of concurrent call counts. This application was so far off the > typical product specifications > that nothing published by Digium or anyone else could anticipate > those surprises that > come when you least expect. > > ..mike.. >
I don't think anyone is expecting any rough numbers from Digium about the telco's ingress/egress. Thanks, Steve Totaro _______________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
