A method for mediating a plurality of user applications via an application relating to a Stream Control Transport Protocol, called a generic application. The method is implemented in an agent device, capable of establishing a connection based on the Stream Control Transport Protocol with a terminal device. The method includes: receiving from the terminal device a request packet of the Stream Control Transport Protocol comprising a data fragment containing an identifier of a user application requested by the terminal device and further comprising a header containing a destination port identifier dedicated to the generic application; verifying that the requested user application is an application of the plurality; and in the case where the requested user application is an application of the plurality, transmitting to the terminal device an agreement message.