best voip program today

[weatherman]

Hi, what would you suggest as a voip program?
For now to me the best choice seems to be openwengo.
I'd like it to be opensource and possibly qt.
Thanks in advance.

[kabads]

You have tried Ekiga no? I've not come across anything as good as this on Linux (X-Ten software is a little quirky). You could also try kde's (Kphone?) soft-phone to determine if that's what you're after.

[Donnut]

Skype. NOT beta version, It locked the whole kernel after a few hours.

[kripkenstein]

Tapioca is nice. It interops with Google Talk VoIP.