Device communication without revealing mobile station international ISDN number (MSISDN)

摘要

A communication method for use with a telecommunications system is disclosed. The telecommunications system comprises a network core 3 and a plurality of subscriber devices A, B registered with the network core 3. The core 3 enables communications to be routed to the devices by a respective ID allocated to each device. The method enables special communications to be routed to respective devices in a group of the devices by addressing the devices with a respective special identifier. The method further includes maintaining a store 224 of the special identifier of each device in the group and a corresponding value derived from the ID. The method enables the special identifier of a device in the group to be obtained from the store 224 by providing the store with the corresponding value derived from that device's ID. Communications such as instant messaging can operate between said devices via a third party communications system without revealing a devices Mobile Station International ISDN number (MSISDN) to the third party.