Mitigating SPIT (VOIP Spam) as an Antispam Technique

Nowadays we are getting various calls disturbing our day-to-day activities. The current example may include the bank calls that we are getting for taking various loans likes students purpose, business purpose and other purpose and whatsoever reason as we are not concerned with it. So there should be some unique method or the combination of the various Antispam techniques and this combination can be used to mitigate or reduce the spam calls or we can say Spam over Internet Telephony (SPIT). There are usually many Antispam techniques available that can be used but in this paper the main techniques that we are going to work are as follows: (1) Grey listing and (2) Handshaking/Challenge/Turing test. The combination that we are doing is with the grey list method with the Handshaking/Challenge/Turing tests. Once the user passes the Turing test he will be passed through the grey listing method and finally a decision will be made whether a call is spam or not. The main objective of this paper will be to analyse the techniques and find out the best possible combination of the techniques to Mitigate SPIT.