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Artemisa is a honeypot for VoIP (SIP) networks. It is designed to connect to a VoIP domain as a user-agent backend in order to detect malicious activity at an early stage and also adjust the policies of the enterprise in real-time.
KTuxcall is a port of another project, called tuxcall, for the KDE environment. His mission is detect incomings telephone calls when the modem is being used. This can be get scanning the phone line and detecting the waiting call tone (required).
SpITAssassin will be an enhancement to the successful SpamAssassin to detect Spam over Internet Telephony. This projects extends the SpamAssassin-functionality to insert SIP-compatible headers marking possible Spit-calls.