Skype64 or SIP alternative?

["Nuno Magalhães" <nunomagalhaes@eu.ipp.pt>]

Greetings,

The only deb skype.com has is for i386 and i'm running AMD64.

So, i tried using the static version
(http://www.skype.com/go/getskype-linux-static) both with "linux32
./skype" and just running the ./skype but i get the same result: it'll
start, try to log in and fail with "Another skype instance may exist".
There are no other instances.

I'm trying to use 2.0.0.72 but i'll gladly use any skype-compatible
foss SIP-alternative. My sound system is ALSA and i'm using unstable.
I also tried adding
deb http://download.skype.com/linux/repos/debian/ unstable non-free
but apt-cache will not find any package.

Any suggestions?

-- 
Nuno Magalhães