A request is originated by a mobile station, wherein the request contains information relating to both packet-switched communication and circuit-switched communication of data in a session. The request is originated by the mobile station in response to detecting that a transfer is to be performed from a source packet-switched access network to a target network in which different parts of the session is to be communicated in the packet-switched domain and circuit-switched domain. The transfer is completed using the information in the first request.