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I am concerned with the "big brother" privacy,
Then, sadly, Ekiga is *not* the answer for your needs as it doesn't
support encryption. (one of the reasons it's not a fit for my needs).
Kphone, Jitsi, Mumble, QuteCom, Linphone, MicroSIP, SFLPhone, and Blink
do. Note that not all are multiplatform, see one of my previous posts to
this thread for a list of those that are ported to the three main PC
platforms.
Note also that Skype is encrypted, but Skype has a history of handing
out the private key.