A telephony user device capable of establishing a communications session for communication of data in a data communications network, the telephony user device including a processing system configured to provide a reconfigurable graphical user interface, establish a telephone call with a voicemail system, establish a separate communications session, separate from the telephone call, for the transfer of data to/from the telephony user device, on the basis of one or more call party details associated with the telephone call, and reconfigure at least a part of the graphical user interface in accordance with configuration data received via the separate communication session, the configuration data relating to and/or being derived from the voicemail system.