Abstract: A system and method are described for causing the delivery of interactions, which are triggered by a user, who is connected to an advertisement server with user equipment via an operator network. The interactions are triggered by the user selecting an advertisement provided by the advertisement server, the interactions entailing capabilities of the operator network. The advertisement server is not provided with the subscriber identifier of the user. For this reason, the system, which is external to the advertisement server, comprises an access module configured for detecting to which operator the user is subscribed, obtaining the subscriber identifier and determining the operator network capabilities in order to deliver the interaction.