OnSIP Click-to-Call is an extension for Google Chrome. Using the OnSIP Hosted PBX service, click on any phone number on a page to dial it. Single-click on the extension's icon to toggle the extension ON or OFF. Double-click the icon to open the "Settings" page where you can set your OnSIP telephone number address. After installing the extension, all phone numbers on the pages you visit will be converted into links which will initiate a phone call when you click them.