A method is provided for notification of an event relating to execution of a procedure for processing a communication session to be supported by a communication device belonging to a set of devices associated with a user. The method includes: reception of a subscription request from a so-called subscriber terminal belonging to the aforementioned set, requesting subscription to an event notification service for at least one so-called event that may occur on a device in the set; reception of information indicating an occurrence of at least one so-called event on a device in the set, other than the subscriber terminal; and sending an event notification to the subscriber terminal, signalling the occurrence.