Hi Graham, We have always budgeted for 100kbs/external call on VoIP, regardless of the protocol/codec used.
I think the bandwidth calculator is more realistic for connections inside your network, but once you pipe out through and ISP, traffic looks a little different. There is _some_ ISP overhead which needs to be accounted for. Ross Chappel of EPI Internet tells me they see a 5-10% overhead for packet wrapping - generally for acknowledgements. They also see/expect an additional 5-10% for "other overheads associated with managing protocol transmissions, resends due to collisions or other factors". So, a session suggesting it uses 85kbs might actually be 100kbs or more at the ISP end. Therefore, if you are on DSL - you will have between 640kbs and 800kbs available on your uplink side. Divide by 100kbs/call and you get your capacity. In your case, assuming the lower end of the uplink scale, your limit would be 6. Hope this helps. I also hope it's right... because I'm basing a lot of calculations on this! Doug > -----Original Message----- > From: Graham Todd [mailto:[EMAIL PROTECTED] > Sent: Thursday, January 19, 2006 11:54 AM > Cc: [email protected] > Subject: Re: [on-asterisk] miscellaneous asterisk questions ... take your > pick :-) > > Leif Madsen wrote: > > On 1/18/06, Graham Todd <[EMAIL PROTECTED]> wrote: > >> - Are there any online resources folks could refer me to re: > network/bandwidth > >> usage in different "typical" asterisk deployments? The ORA Asterisk > book has a > >> chapter on hardware but how best to estimate bandwidth requirements? > > > > Try this: http://www.asteriskguru.com/tools/bandwidth_calculator.php > > Excellent! Not sure why I am stuck at 6 connections for conferencing > (perhaps upstream connection limits from my provider). > > Thanks for this and other tips. > > cheers, > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED]
