Make and receive calls from your computer:
At the bottom right of the screen you will find an icon to see the instructions. Click "For Desktop".
Download the Zoiper application in the link "Download here" according to the operative system of your computer and choose the free version.
Once the download is complete, run de application. A window will appear asking what do you want to do, click on "Save file". The installation wizard will guide you step by step.
When the application finish you will have your extension ready to use it from the computer.