Method of providing value added service in a packet switched telecommunications network and a service interface adapter for use in such method

摘要

A method of providing in a packet switched telecommunications network, for a communications session involving a user of said packet switched telecommunications network a value added service associated with a circuit switched telecommunication network. The method comprises the steps of establishing a first signaling data stream of a first basic call state model of a packet switched dedicated protocol type between the packet switched telecommunications network and a service interface adapter unit, and establishing a second signaling data stream of a second basic call state model of a circuit switched dedicated protocol type between the service interface adapter unit and the circuit switched telecommunications network, based on information from the first signaling data stream, for providing the value added service from the circuit switched telecommunications network. The information is augmented with further information for establishing the second signaling data stream, and for exchanging data between the first and second signaling data stream for providing the value added service to the user through the packet switched telecommunications network.

主权项

1. A method of providing a value added circuit switched service to a packet switched user device, the method implemented by a service interface adapter comprising the steps of:
receiving a Session Initiation Protocol (SIP) Invite message; verifying whether the SIP Invite message is related to an audio or video session; if the SIP Invite message is not related to an audio or video session, then returning the SIP Invite message to an Internet Protocol Multimedia Subsystem (IMS) network; if the SIP Invite message is related to an audio or video session, then determining whether the SIP Invite message is associated with an originating communication session or a terminating communication session; if the SIP Invite message is associated with the originating session, then identifying said packet switched user device based on a P-Asserted-identity parameter in said SIP invite message; if the SIP Invite message is associated with the terminating session, then identifying said packet switched user device based on a Request-Uniform Resource Identifier (Request-URI) parameter in said SIP invite message; after the identifying step, retrieving subscriber data associated with said packet switched user device; verifying, based on the retrieved subscriber data, if said packet switched user device has active Intelligent Network/Customized Applications for Mobile Networks Enhance Logic (IN/CAMEL) services in a circuit switched telecommunication network; if said packet switched user device does not have active IN/CAMEL services, then returning the SIP Invite message to the IMS network; if said packet switched user device does have active IN/CAMEL services, then perform following steps: establishing, based on information from said SIP Invite message and augmented with further information, a circuit switched type signaling stream of a basic call state model of a circuit switched dedicated protocol type between said service interface adapter and said circuit switched telecommunications network; providing the circuit switched type signaling stream to said circuit switched telecommunications network for requesting and receiving the requested value added circuit switched service therefrom; and exchanging data between said circuit switched type signaling stream with said circuit switched telecommunications network and a communications session that the packet switched user device currently has ongoing with the IMS network to provide said value added circuit switched service which is an IN/CAMEL service from said circuit switched telecommunications network to said packet switched user device through said IMS network.