Method and system for managing call routing in a network environment including a circuit-switched network and an IP Multimedia Subsystem IMS

摘要

A network node and a method for call routing by a network node disposed in a network environment including a circuit-switched (CS) network and an Internet Protocol (IP) multimedia subsystem (IMS) network, the method comprising: receiving a message for setting up a call; allocating_an IP Multimedia Routing Number (IMRN) for purposes of setting up the call; sending the IMRN to at least one of a user equipment (UE) device and a mobile switching center (MSC); receiving a subsequent message containing the IMRN; and setting up the call using an original called number that maps to the IMRN, wherein the setting up of the call comprises inserting a CallerID by said IMS.