This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
For Application to get started is you need a SIP server, which is an open source. And necessary steps i.e is call establishment,call hangup, call conference etc. would be made though specific commands,which need to send to sip server