Patent ID: 7881288

Claim:
A method in a telecommunication network for routing, by a service control node, a media stream from an IP Multimedia Subsystem (IMS) domain to a Mobile Switching Centre (MSC) associated with a mobile station in a circuit switched domain of a public land mobile network (PLMN), wherein the mobile station is identified by a logical address, the method comprising the steps of: said service control node sending a first request for a physical address associated with said mobile station to a Home Location Register (HLR) associated with said PLMN; said HLR sending a second request for said physical address to said MSC; said MSC sending said physical address to said HLR; said HLR sending said physical address to said service control node; said service control node sending said physical address to a traffic control node in said IMS domain; said traffic control node sending a request for routing path data associated with said physical address to a routing server; said routing server sending said routing path data to said traffic control entity; said traffic control node using said routing path data for routing said media stream to said MSC, wherein the routing path data at the step of sending said routing path data to said traffic control entity by the routing server, is obtained from a range of the physical addresses associated with the MSC, the association of the routing path data and the range of addresses configured in the routing server, wherein the routing server sends the routing path data for that MSC associated with the range.