An device (A) is dedicated to controlling the implementation of functions linked with providing at least one communication service to at least one communication terminal (T1) in a service equipment (SA1) belonging to an Internet communication core network (NC). The device (A) comprises control means (CM) which, upon receipt of a request for providing the service offered by its equipment (SA1) for a given communication, are tasked with (i) deciding to implement at least one function selected from among the functions offered by the equipment (SA1); and, subsequently, (ii) inserting data signaling that decision into at least one of the signaling messages sent by the equipment for the communication in question, which are intended for at least some other service equipments (PS1, PS2, SA2, MR1) of the core network (CR), so that they can prohibit themselves from implementing the selected function for the duration of the given communication.