The present application relates to a method and a communication system with which participants of a scheduled meeting, in particular a business meeting or conference, can be reached by a telephone caller without the caller needing to know the telephone number of the participants. Conventionally, the caller who does not have available the corresponding number must obtain said number by calling a telephone switchboard or by searching in an electronic address book. This disadvantage is overcome by the subject matter of the application by the fact that a connection to a meeting participant, preferably the organizer of the meeting, is established using only the telephone number of the caller. For this purpose, the caller is identified by the caller's telephone number, and thereafter an address book is examined to determine whether the caller is a participant in a meeting. If yes, the organizer of the meeting or the organizer's telephone number is obtained, and the connection to the telephone number thus obtained is forwarded on.