Two great softphones, download and install the one that works good for you, you can in fact install both of them at the same time and use.

Black Softphone Newly developed by our developers, this softphone is a very light and hightech application with many great features and a robust voice engine.	Download Black Softphone
Blue Softphone with SMS Service Our classic softphone SMS service and nice looking design with customer service features such as account recharge, support etc.	Download Blue Softphone

System Requirements:

1. Windows XP.

2. Windows Vista.

3. Windows 7

4. A headphone with mic.

(May work on Windows earlier versions than XP but it is not guaranteed)