A network equipment is dedicated to radio access networks of different types connected to a backbone network to which is coupled at least one application equipment including at least one external application adapted to exchange data with at least one internal application installed on multimode mobile terminals and further comprising at least two network interfaces adapted to be connected to radio access networks. The equipment comprises management means adapted to transmit to a designated terminal a control software module adapted once installed to provide a proxy interface function between internal and external applications adapted each time that it receives a transaction request designating an external application from an internal application of the terminal to determine which of the network interfaces of the terminal is suited to the transaction as a function of control information and routing information and then to instruct the operating system of the terminal to transmit the transaction request to the designated external application via a transport level connection between the determined network interface and the application equipment containing the external application.