3CX program for Linux

I guess “3CX” application not exist for Linux, I mean is https://d1ihx0ymjgeqr0.cloudfront.net/wp-content/uploads/2013/02/3CXPhone-Windows.jpg and I want to know which application is a good replacement.

Thank you.

It does, but are you looking for a soft phone application that works with Asterisk?

Yes. I need an application for work with Asterisk.

Zoiper is one I have been using;

I like Microsip: www.microsip.org

Just it for Windows OS?

I guess it is not free!!!