PURPOSE: An attack detecting method using a safe sip protocol and system thereof are provided to supply a protocol which a reinforced authentication and security about a SIP packet. CONSTITUTION: An SIP analysis module(252) checks a session status through an IP former model. If the checked session state is a negotiation state, the SIP analyzed module checks the state through encoding/decoding algorithm(258). The SIP analysis module updates a backlist to a blacklist storing unit or outputs a packet. The encoding/decoding algorithm operates with a SIP formal model unit and the SIP analysis module. The encoding/decoding algorithm encodes or decodes a communication packet corresponding to various password algorithms.
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