A mediation unit (2, 3, 4, 5) in a telecommunications network for mediating between an application service provider (1) and a plurality of service providers (6), said unit (2, 3, 4, 5) comprising recovery means (2, 3) for recovering data concerning users from various service providers (6) and acquiring indications qualifying a user and qualifying one or types of data required on that user, such indications being issued by the application service provider (1), which mediation unit is characterized in that it comprises means (4, 5) for identifying a selection of service providers (6) containing the type of data required by the user, the recovery means (2, 3) further taking account of this selection so as to interrogate only service providers (6) selected in this way.