X-Lite is a next generation softphone client offering users all the productivity of a traditional telephone with desktop and mobile computer enhancements. X-Lite has designed to work over IP-based systems; it provides endpoint VoIP solutions that use internet-based telephony servers within an enterprise LAN (Local Area Network) or VoIP service provider network.
the configuration is too much easy. followings are the things to do when working with Asterisk PABX
above figure shows the main settings to user to communicate with others. study it and do your own. give the IP of your Asterisk server as the domain