SIP has been here since 1999, telecommunications also adopted it, lots of stable software, smooth cooperation, lots of suppliers. Some thought that by introduc

SIP has been here since 1999, telecommunications also adopted it, lots of stable software, smooth cooperation, lots of suppliers. Some thought that by introducing a new protocol they could generate better business/profit. I see no other advantage in Matrix. There's nothing important in Matrix that can't be done in SIP, and there's nothing in Matrix that's much more deserving of a new protocol. There are many standard extensions for SIP, and if you're still missing something, it's easy to add. Disclaimer: I am a SIP fan and I hate reinwenting the wheel