This publication discloses a method and system for delivering messages in a telecommunications network (1, 2, 6, 11, 12). In the method a voice-message call attempt is received (43), or a connection is formed to a potential user of a service, on the basis of a voice-message call attempt. According to the invention, as a response to the voice-message connection formed or to the call attempt, to the second part (41) of the connection is sent a text-form message, which initiates a long, logically continuous, temporally discontinuous session N, in such a way that the sender address (e.g., the A number) is converted to correspond to the session number N and the session stage J at the time, and in the message there is at least one selection query.