SIP has greatly contributed to VoIP and IP Communications in general to a degree that few truly appreciate. It has simplified the implementation of new technologies that make deployments faster and more efficient. Read more on SIP.
reSIProcate is an extension that leverages SIP to deliver inteligence where developers can build applications that have much more than just simple SIP features. It is the next level in SIP implementation. The working group is lead by an industry veteran and the participants are well know in the telephony and SIP community. This will be important to all working with SIP. Read more on reSIProcate.