The Federal Office of Communications (OFCOM) allocates 0900, 0901 and 0906 numbers individually. Holders of these numbers can offer a service which is paid for by the caller via a supplement to the connection charge. Additional information on the use of these numbers can be found here.
This document is part of the Technical and Administrative Regulations for routing and identifying the location of emergency calls (SR 784.101.113 / 1.3). It contains the geographical distribution of the coverage areas of the rescue services and routing numbers for routing emergency calls.