Carrier selection in an IP multimedia subsystem (IMS)

摘要

Method and device for a carrier selection in an internet protocol multimedia subsystem. The present invention provides for solutions for a call-by-call as well as for a pre-subscribed carrier selection. Further, the invention provides for a solution which does not require any changes in the session initiation protocol like for example a new SIP header or novel or changed parameters. Further, also the user equipment does not require any adoptions with respect to the carrier selection.