US Patent 7162023 Service oriented networks

In a telecommunication system, adapted to provide subscriber related services, a layered architecture including on a service layer a network side service executor and a user terminal service handler is employed. A call is triggered through a user interface provided by the service handler, which conveys a call set-up request and information to the service executor. The service executor communicates directly with a corresponding service executor at a service layer of a destination system and exchanges service information to detect a service interaction problem. A requested call can be established by other signalling and media handler functions when no essential service interaction problem is detected.