I've looked at Ekiga and it doesn't talk
to Skype so I wouldn't be able to talk to friends who I haven't been
able to convince to switch to Linux, :-) Also, Skype allows free phone
calls to 800 numbers which allows me to use my computer as a speaker
phone for conference calls with great audio. I just have to put up with
the ribbing I get when someone who I am talking to on Skype sends me a
web page link and doesn't understand why I can't hear the audio that's
playing, but I'll survive.