Sure, but vendors have already spent years working the reg-avalanche problem out for subscribers. One of my fears with this config framework is it's changing it, without a way to undo/not-do the change. -hadriel ________________________________________ From: Henning Schulzrinne [mailto:hgs@xxxxxxxxxxxxxxx] Sent: Tuesday, April 06, 2010 1:59 PM To: Hadriel Kaplan Cc: Cullen Jennings; IETF Discussion Mailing List Subject: Re: Last Call: draft-lawrence-sipforum-user-agent-config (Session Initiation Protocol (SIP) User Agent Configuration) to Informational RFC Avalanche (restart) has its own set of problems - including overwhelming either the HTTP server, SSP or registrar. (In a draft, we've made proposals how to address this in some cases, as long as the UA can detect that it is likely part of an avalanche.) As we've seen from the SIP overload discussion, you can't rely on the "natural" throttling of the server to nicely space out requests - the whole thing is much more likely to collapse in a heap, so that no useful work gets done. This affects registration, subscription and retrieval more or less equally. Henning _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf