Abstract: The invention relates to a packet-switched part of a mobile communication system, utilising PDP addresses as temporary or permanent network-layer subscriber addresses. With the PDP context a mobile station (MS) is connected to different PDP addresses. A PDP context comprises different data transmission parameters, such as QoS and TFT. The user can modify his PDP context. The invention comprises storing (3-6) the original TFT parameter at least for the duration of the PDP context modification, so that it can be returned (3-9) to the gateway GPRS support node (GGSN) if the radio network does not accept the new QoS profile during the PDP context modification.

Abstract: A method for intercepting sessions is provided. The method includes the steps of identifying a packet of a session to be intercepted based on media component information of the session, and, if the packet to be intercepted is identified, providing duplicated packets of the session to an interception management element.