I tried to install skype using the command

Code:
sudo apt-get install skype
I get the following error

The following packages have unmet dependencies.
skype : Depends: skype-bin but it is not installable
E: Unable to correct problems, you have held broken packages.

I have gone through various forums, followed the steps, but I ended up with the same message as above.

FYI, When I type uname -a in the terminal, I get this
Linux ubuntu 3.5.0-22-generic #34-Ubuntu SMP Tue Jan 8 21:47:00 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

I need some help to install skype.

OR

Please can someone point me to an alternative to skype that can interop with multiple voip software including skype.