This is a common setup for Asterisk. In very small installations, Asterisk can be used to give us the features we need from an expensive PBX system at small office prices. Using Asterisk as a phone system for a home office gives the small business a big-business sound and feel.
For our first example, we will join David in his home. An avid programmer and all-round geek, he's decided he wants to have his very own phone system in his house. As he is often busy and unable to answer the phone, the system must have voicemail. He has recently moved into an older home and only has one incoming line from the telephone company.
David has a new baby in the home and is very concerned about safety. He lives out in the middle of nowhere, and loses power pretty regularly. He only has phones in the office, kitchen, and master bedroom.
Finally, David would like to have music on hold for people who call in. As he is starting a new business, he wants to present a professional...