You may have employees who work from home, or who are on the road a lot. No need to take messages for them; they are connected to your Business-Phones.US system no matter where they are. As long as they can get to an internet connection, they are online just as if they were in the office. Even in a hotel room in Switzerland, their phone extension will ring and they can make calls through the business system.
You may also assign extensions on your system to favored customers or vendors. This will allow them to reach you at no cost at any time. They appear just like any office phone extension. And it doesn’t matter where they are; extensions can be assigned in any location where there is an internet connection.