Abstract: A method is proposed for monitoring a connection between end devices via a communications network. A set of modes having at least two monitoring modes and a ranking order associated with the set of modes, are agreed upon between the end devices and a network device present on a path between the end devices. The method includes an activation of the set of modes, corresponding to an activation of the first mode according to the ranking order; then an activation, according to the ranking order, of each other mode of the set of modes. Each monitoring mode includes at least one mechanism implemented by at least one of the end devices and enabling the network device to perform at least one function of monitoring the connection.

Abstract: In a method of recognition of a chronicle from a set of possible chronicles, each of said chronicles consists of a set of events related to one another by pre-determined conditions, said events comprising elementary events and complex events corresponding to a specific combination of at least two elementary events. The method comprising the following steps: obtaining a series of elementary events; determining at least one chronicle, called a presumed chronicle, that meets at least certain of said conditions interrelating said elementary events, from among said set of possible chronicles; and for each of said presumed chronicles, identifying at least one complex event that has to be present in said presumed chronicle; verifying the presence of said complex event from corresponding elementary events; confirming the recognition of said chronicle if said complex event or events are present; so that only the complex events necessary for said recognition are computed.