TerraSip Phoner is a small application program that has been written and designed to make it easy for you to make your calls directly via any computer running Windows. Once installed you can use TerraSip Phoner to talk to other TerraSip members wherever they may be worldwide, for as long as you like completely free of charge. If you want to call somebody who is not yet a TerraSip member then simply enter your contact's regular telephone number and start talking! Calling normal telephone numbers is not completely free of charge, but it is extremely affordable and excellent value compared to any other phone service.
TerraSip Phoner is simple and easy to understand and use. You don't need any technical knowledge or special hardware other than a headset or speaker and microphone. Installation is very straightforward - just a few clicks of the mouse button and you can be making calls. Just let TerraSip Phoner do all the work! Though the TerraSip Phoner interface is very intuitive, should you not understand something you can always read the detailed instructionshere:

You can begin using TerraSip Phoner immediately after installation and start making calls all over the world! Why not put a copy of TerraSip Phoner on your notebook? The application is freeware so you can keep as many copies as you like - and having TerraSip Phoner on your notebook means you have instant access to all your contacts wherever you are - your telephone and your personalised connection travels with you!

What else do you need ?
Your computer with ADSL or Broadband Internet Access
A headset and/or a loudspeaker/microphone combination which enables you to talk and listen.
Your TerraSip Account with Sipkey (that is your Internet telephone number)
and a password.