Patent ID: 7162023

Claim:
A service oriented telecommunication system, said service oriented telecommunication system adapted to provide a basic call service for call set-up, maintenance and tear-down and a subscriber specific supplementary service to a system associated subscriber, for detecting and preventing a possible subscriber specific supplementary service conflict due to a call setup request, said system conforming to a layered system model comprising a service layer, a signaling layer and a media layer, said system organized with a user terminal side and a network side, and adapted to provide a subscriber specific supplementary service to a system associated subscriber operating from a user terminal associated with a user terminal side subscriber specific supplementary service handler element residing in the signaling layer and being operatively associated with a network side subscriber specific supplementary service executor element residing in the service layer, wherein the user terminal side subscriber specific supplementary service handler element includes a user interface means allowing an originating user to generate an originating call setup request, and adapted to convey via a first service layer path to said network side subscriber specific supplementary service executor element a call service request message including said originating call set-up request with call set-up information specifying a destination user, the network side subscriber specific supplementary service executor element being adapted: to exchange via a second service layer path, originating user related and destination user related service information, with a corresponding network side subscriber specific supplementary service executor element residing in a service layer of a corresponding service oriented telecommunication system of said destination user, to detect a subscriber specific supplementary service interaction conflict on basis of said service information, and to convey the call setup request to a network side signalling handler element residing in the signalling layer of the service oriented telecommunication system in response to an analysis result indicating no conflict and to convey a conflict indicating message to the service handler in response to an analysis result indicating a conflict, and the network side signalling handler element being adapted to convey call information to a network side media handler residing in said media layer and being adapted to handle media corresponding to a call setup.