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SIP is able to support MH mobility at the application level using a redirect server. SIP, however, performs signaling on the basis of an open network, the Internet. Thus, it is exposed to security threats that do not exist in a closed network such as PSTN. Although much research concerning SIP security threats have been conducted, studies regarding security threats under a SIP application-level mobility supported environment are relatively fewer in number. The aim of this paper is to analyze security threats under a mobile SIP environment. Moreover we argue that our suggested approach, through an extended application of the SIP INFO method, handles SIP mobility threats effectively without additional functions or systems.