Asterisk is not limited to being able to service only one company. With a little finesse, we can configure Asterisk to handle multiple companies without the need to be aware of the others' presence. Although our example will deal with multiple companies on one site, there is no reason the same principles could not be applied over a high-speed data network.
Al's Computer Depot was a very large computer retailer in the early 1990s, back when computers were fun and profitable. Unfortunately, Al got a bit too used to very high margins on computer sales, and has moved out of the computer selling business. He and his team have moved into consulting. As a consulting firm, 90% of the employees are traveling at any time.
Al's wife operates a small boutique selling Asian knock-off wallets. As most of the offices are empty all of the time, Al decided to let her have an office to run her business from. And with such a business, Sue needed a telephone line, but it would be no good...