— Richard Shockey Shockey Consulting LLC Chairman of the Board SIP Forum www.shockey.us www.sipforum.org richard<at>shockey.us Skype-Linkedin-Facebook rshockey101 PSTN +1 703-593-2683 > >As I understand SIP use, the multi-hop mechanisms are another example of >tightly-control operational prior arrangement, behind the scenes. So it >might qualify for "at scale" (though it might not) but it's operation >isn't sufficiently open -- ie, permitting /casual/ interoperation. True Dave. There are a fair amount of constraints that have to be applied on a per hop basis but it does scale. I would say dialing a phone number is pretty casual interoperation.. ☺ SIP URI as identifiers never took off [ yes Virginia Telephone numbers are still here) but its use in core carrier networks along with the 3GPP IMS super set is now dominant. In the US that is now about 40% of all Voice minutes in the interconnected Public SIP Telephone Network aka PSTN. With VoLTE it will be nearly 90%. > >I'm a fan of xmpp/jabber, but it, too, simply hasn't attained sufficient >'at scale' use. > >Hence my slightly-modified claim that, other than email and DNS (and, >yes, BGP), we have been strikingly unsuccessful at deploying new >distributed application services and getting them to be successful at scale. > > > >d/ > >-- > > Dave Crocker > Brandenburg InternetWorking > bbiw.net >