go to http://www.tjnet.com/software/index.htm and look for "Tjinit ver12.00"
It will have the following description:
After downloading and installing the software, launch your favorite VOIP program first, then launch the TJ init program, then configure your favorite VOIP program to use "USB Internet Phone by TigerJet" as a default audio and default recording device.The TJ init Utility has been developed to enable third party VOIP applications (such as Dialpad, Net2phone,STanaphone, Msn, Netmeeting...) to use our hardware without modify their software."
EDIT: Oh, i almost forgot. When you want to dial the phone number, you will need to open your VIOP program's window, and click on the area where you type, then on your phone, dial the number you want, and then hit the "#" button twice.
My apologies if this is already posted.