Design Of Anti-spam Call System Based On IMS Security Mechanism

IMS is a subsystem which supports to IP multimedia Operation that is brought forward by 3GPP, aimed at creating an access independent, based on open SIP / IP protocol and supporting multiple types of multimedia services platform to deliver rich business. With the introduction of the IMS, the numbers of voice users are expected to increase dramatically. Spam call has been a serious problem for IMS voice call causing frustration and annoyance to the customers. This problem is growing at a very fast rate. This calls for a cause of concern, as the tools and methods that have been used for blocking email spam may not be suitable for real-time voice calls. In addition, IMS has URI type addresses, so the same methods that were used to generate automated e-mail spam messages can be employed for unsolicited voice calls. Spammers will always be present to take advantage of and adapt to trends in communication technology. Therefore, it is important that IMS take measures to alleviate the problems of spam. Recent solutions proposed to block SPIT have the following shortcomings: restricting the users to trusted senders, causing delays in voice call set-up, reducing the efficiency of the system by increasing burden on proxies which have to do some form of Bayesian or statistical filtering, and requiring dramatic changes in the protocols being used.Anti-spam Call System Based on IMS Security Mechanism should be able to fully utilize the standardized authentication and authorization measures that are included on an IMS framework. The solution proposes that addresses of decoy UEs deployed on several IMS access networks. These addresses are harvested by SPIT senders using automated programs. When the spammers hit different decoy UEs, their IMS accounts are blacklisted, and they are prevented form making further voice calls.The proposed anti-spam call system for the IMS fits well with the existing protocol structure and customers are oblivious of its operation. The feasibility of the solution was demonstrated using the evaluation framework. The test performed well under high conditions. Further, the proposed solution blocked the spammers irrespective of the spammers' call rates. A stress test is performed proving that the system causes little overheads to the system, and there is little delay in banning the spammers. And the system did not cause any delays in call set up. The anti-spam call system implemented in an IMS network is effective in blocking SPIT.