With Skype becoming more and more intrusive now that Microsoft has taken it over, people are looking for alternatives (me included). One Skype alternative that has come to light is the all-in-one app called Jitsi.
Read more here: Big brother Microsoft listens in to your Skype IMs
Jitsi is an audio/video and chat communicator that supports protocols such as Google Talk, SIP, XMPP, MSN Messenger, Yahoo Messenger, AIM, ICQ, and Bonjour and many other useful features like conference calls, desktop sharing and Jitsi is multi platform (Linux, Mac, Windows). Jitsi is Open Source / Free Software, and is available under the terms of the LGPL.
One of the nice features Jitsi holds over Skype is encrypted instant messaging and call encryption with SRTP and ZRTP.
Jitsi is under active development and the following list of features will probably evolve rapidly so check it out...
To use the Jitsi debian/ubuntu repository just download and install Jitsi’s DEB PACKAGE. It will automatically add their repository to your system so that it will keep Jitsi up to date.