Patent ID: 8457046

Claim:
A method for multiple registration of a multimodal communication terminal via at least one access network in an “Internet Protocol Multimedia Subsystem”-based service communication system (IMS) of a mobile and/or convergent communication system, wherein the multimodal communication terminal is registered for at least one communication service via a first access network in at least one service control unit of the IMS-based service communication system, comprising: generating and transmitting, in order to register the multimodal communication terminal via at least one second access network, a registration message which is generated and transmitted to the at least one service control unit of the IMS-based service communication system, deriving an access technology of the at least one second access network from an information provided in the registration message; checking whether the access technologies of the first access network and the at least one second access network are different; depending on the result of said check, performing one of a further registration of the multimodal communication terminal in the IMS-based service communication system and substituting a new registration for an existing registration.