METHOD FOR PROVIDING A VIRTUAL NUMBER SERVICE IN AN IMS(IP MULTIMEDIA SUBSYSTEM) AND A DEVICE THEREOF, USING THE EXTENDED FUNCTIONS OF AN SDP(SESSION DESCRIPTION PROTOCOL) PARAMETER OF A SIP MESSAGE

摘要

PURPOSE: A method for providing a virtual number service in an IMS and a device thereof are provided to prevent the duplicated generation of billing information by not modifying the existing tag information of a message header field.;CONSTITUTION: An outgoing S-CSCF(Serving-Call Session Control Function)(110) routes a corresponding SIP(Session Initiation Protocol) message to an application server(300) for a virtual number service. The application server adds an actual number in a message body field of the SIP message. The application server generates a new response message by adding trigger information in a message header field. The outgoing S-CSCF transfers the SIP message to an incoming S-CSCF(210). The incoming S-CSCF changes a URI(Uniform Resource Identifier) of a beginning line field based on the actual number of the SIP message.;COPYRIGHT KIPO 2010