A phone extension is an additional number which can be entered to reach a real person in a phone system. This allows callers coming in on a single number to be routed to specific people in an office setting.
WebFones takes the idea of the phone extension to a new level by introducing the User Extension. A User Extension works like a phone extension but is designed to contact a real person rather than ring a specific phone. User extensions can have many phones and mobile devices (home office, regular office, cell phone, iPad, etc).