A method for performing an inter-system handover of a user terminal in a telecommunications network comprising a first telecommunications system operable according to a first protocol and comprising a first service subsystem and a first access subsystem and a second telecommunications syste m operable according to a second protocol and comprising a second service subsystem and a second access subsystem; the user terminal storing capabilit y data indicative of the user terminal's capabilities for communication with t he service subsystems and the access subsystems.
