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Voice over internet protocol (VoIP) communication services have been widely used in recent years. VoIP is a real-time communication service prone to attack; once attacked, it is more difficult to be addressed in real time as compared to off-line Email. The attacker may transmit large sum of online request messages to the SIP server to cause congestion or even breakdown of the machine to make it unable to provide services. The proposed defense mechanism will filter malformed messagesdoi:10.7763/ijfcc.2013.v2.203 fatcat:nie2yvpz7bcmjkqclcixd32eoy