next step for the use of dns.

ENUM functionality provides the user the ability to have a single point of contact (such as a phone number) to be used for all methods of both voice and data exchange, thus converging the independent functions of the circuit switched PSTN and packet switched DNS. ENUM is a voluntary technology, making it easier to find alternatives to circuit switched technology, that consumers or enterprises may choose to use to facilitate communications. (enum info)

i knew there are a lot of different networks around (some), but i didn`t know there are so many different telephon numbers for special purpose.