Abstract: In a telecommunication network a subscriber connected to an originating local exchange requests activation of a supplementary service. The supplementary service establishes an end-to-end TC-dialogue with a corresponding supplementary service of a destination local exchange. The TC-dialogue terminates the request on an interfering telecommunication service in an intermediate node. For preventing service operation failure in case of interaction between the supplementary service and the interfering telecommunication service, a relay link is established between an incoming TC-dialogue and an outgoing TC-dialogue at the intermediate node to realize a chain of end-to-end TC-dialogues between the originating exchange and the destination exchange, while using a transparent relay functionality independent of utilizing TCAP based supplementary service ASEs as intermediate nodes.

Abstract: A system and method of providing CCBS services over GVNS. In a network service with routing code recalculation, a supplementary subscriber service involves an interaction between two subscribers. Knowledge of a subscriber access code, used in a called subscriber local remote exchange, is required in a calling subscriber local exchange. A subscriber access code is generated by modification of a called subscriber routing code, used by the calling subscriber local exchange. The modification occurs in a transit node of the network service. An interworking problem is then overcome by providing a relay CCBS application service element (CCBS-ASE), in a GVNS transit node, and arranging for end-to-end signaling to be replaced by two TC dialogs, one being the calling parties LE and the relay CCBS-ASE and the other between the called parties LE in the relay CCBS-ASE.