The present invention relates to a method for providing mobility to a mobile node capable packet based communication within a communications system via an access point. The method uses a signed session information package for allowing the mobile node to provide a further access point with information relating to the routing of a communications session so that the first access point can be used as an anchor point for the communications session even if the mobile node has changed its point of access to a further access point, wherein the communications session is a communications session between the mobile node and a corresponding node within a communications system. The signed session information package comprises routing information relating to the communications session and is signed by the first access point which is the access point via which the mobile node was communicating at the time of initiation of the communications session.