System and method for transmitting system messages insession initiation protocol

摘要

Provided is a method for exchanging system messages using Session Initiation Protocol (SIP) by a client device in a system for providing communication service using the SIP, wherein the method comprises the steps of receiving a request message from a server, wherein the request message includes a first content type indicating that the request message is for requesting a confirmation response from the client device, generating a response message corresponding to the request message, wherein the response message includes a second content type indicating that the response message is for responding the request message including the first content type to the confirmation response, and transmitting the response message to the server.