A method for communication, in a packet-mode communication network, between user equipment and a data network. A session is established between the user equipment and a data-network access gateway via an access network. The method includes: detecting a request for access to a service based on at least one packet transmitted by the user equipment via the established session; a first step of determining, based at least one criterion, that a new session is to be established; a step of sending, to the user equipment, a control to establish a new session, the user equipment initiating establishment of the new session; a second step of determining another access gateway, the other gateway being suitable for the service required by the user equipment; and establishing the new session initiated by the user equipment, from which the new session is established between the user equipment and the other gateway.