Intelligent network services in the time of network migration

Over the last several years, the telephony has been moving from the circuit switched (CS) networks, such as public switched telecommunication network (PSTN), towards the packet switched (PS) networks, or more exactly Internet protocol (IP) networks. This migration process should be as transparent as possible for subscribers. Therefore, the existing telephony services in CS networks are also needed in PS networks. These services are realized by the intelligent network (IN) today. In This work we present a novel architecture that enables using of IN services from both, CS and PS networks, transparently for subscribers. The architecture supposes the session initiation protocol (SIP) as the signaling protocol in the PS network. It introduces a new entity responsible for the translation of SIP addresses. For better understanding of our architecture, we discuss how the voice virtual private network (VPN) service, which is a widely used IN service, can be realized with it.