As illustrated in Figure 1.1, there are few pieces of information which are guaranteed to be known to a service provider. First there are, and will continue to be, a number of "types" of agents which users will utilize to originate messages. Probably the most common of these devices has a digit-only based keyboard (e.g. an ordinary telephone). Similarly, there are, and will continue to be, a number of "types" of agents to receive messages. Second, not only will there be a high number of users using all of these agents, but there will also be a very high number of users who will utilize multiple agents. The third piece of information which is known is that most of these agents have their own unique "style" of addressing. Without special processing, these unique addressing styles are not compatible with each other.