Method for carrying out momentary message traffic (Instant Messaging) with packet-switched data

The invention relates to a method for the instant transfer of packet switched data corresponding to at least one data content type between at least two terminals connected to each other by a packet switched network. According to the invention, an information element which is specific to the at least one data content type is transmitted to each element of the network involved in the communication link when a communication link is set up between the at least two terminals.