I yall! Can someone please advise me on this situation?

I have Xubuntu installed on both my hp netbook and Macbook pro 17 3,1. I do not own a smartphone (Or any phone for that matter) but my wife does have an android phone.

We have been using skype (Me for my Macbook xubuntu and her from her android smartphone running ice cream sandwich) to communicate.

I need a solution, a skype alternative. Something I can set up on her android phone and my Macbook pro.

Can I run ekiga on my xubuntu intallation and have her download some compatible android app and set up a sip account?

And if so, I would I go about configuring this?

Thanks!