ENUM is an innovative service based on the Internet’s Domain Name System, which links the communication worlds of telephony and Internet. DENIC eG presents possible applications of this technology at the Vo.IP Germany in Frankfurt am Main on 30 and 31 October 2007 (location: Chamber of Commerce and Industry / Frankfurt Stock Exchange). ENUM and the services linked to it open up the entire world of communication to the user. With ENUM, one single telephone number grants access to PSTN and mobile service, but also to fax devices and even e-mail addresses or websites. In addition to that ENUM is used for the coupling of Voice-over-IP networks