and..

https://www.sipcenter.com/sip.nsf/h...n+A+Dynam ic+And+Competitive+Marketplace

Important spot...
Since SIP is still an evolving protocol there is intensive standardization work done at the IETF in developing and updating SIP-related drafts. For example in 2002 there were 210 distinct SIP working group Internet drafts, 83 SIPPING working group drafts, and 34 SIMPLE working group drafts (not counting version changes - 00, 01….). This intensive standardization work, which is necessary in order for SIP to provide the functionality expected, makes it tedious for one to follow the evolution of the protocol.



[This message has been edited by Coral Tech (edited April 10, 2005).]