Location register and subscriber device for a communication network

摘要

The present invention relates to a subscriber device that is capable of registering on more than one communication network simultaneously, and to a location register for a communication network for recording the networks on which the subscriber device is simultaneously registered. The subscriber device may be active on all registered networks, or only on one registered network. The location register may prioritise the list of network registrations. A method of maintaining the location register and of setting up a call to the subscriber device is also disclosed.