Patent ID: 7627316

Claim:
Method for registration of a called communication terminal with a IMS services network via at least one communications network, the method comprising: allowing a user of a communication terminal to pre-select whether the communication terminal is authorized to receive a forced IMS registration procedure; in response to an IMS service request from a calling terminal, checking whether the called communication terminal is currently IMS registered on the part of a network element of the IMS services network, and if not IMS registered, whether the called communication terminal has been authorized for the forced IMS registration procedure, the calling terminal and the called communication terminal comprising user communication terminals; and when the called communication terminal is not currently IMS registered, the network element automatically initiating a forced IMS registration procedure in the called communication terminal by transmitting a Short Message SMS to the called communication terminal, the Short Message containing an IMS registration request, wherein in response to the IMS registration request, the called communication terminal is automatically registered without user input.