A method and apparatus are provided for processing an item of information indicative of a desire for involvement in at least one application session, established according to the SIP protocol, in progress for a user of a telecommunications network. The at least one session is controlled by a first terminal of the user. The method is implemented by the first controller terminal, and includes receiving a notification of an event relating to the user, which includes at least one item of information indicative of a level of involvement desired by a second terminal of the user, and making a decision relating to the desired level of involvement. In the case of a positive decision, an involvement command is transmitted relating to the level of involvement desired by the second terminal to the telecommunications network.