Thanks for the tip uTMY. This Jitis has .deb and is multiplatform, looks good.

"Tor’s Jacob Appelbaum recommends using Jitsi instead of Skype"

How is Jitsi more secure than Skype when it promotes itself as a client for Yahoo, Windows life?

"Jitsi (previously SIP Communicator) is an audio/video and chat communicator that supports protocols such as SIP, XMPP/Jabber, AIM/ICQ, Windows Live, Yahoo! and many other useful features."

Application of ZRTP to set up secure communication with SRTP, Secure Real-time Transport Protocol used for encrypting the voice /chat on both ends even when it travels over evil servers of yahoo and MS?

So it can use the Yahoo / MS protocols to set up secure voice?