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. • Collaboration among service providers would increase the detection accuracy but has the challenge of privacy and system resources. • This paper proposes a collaborative system for the early detection ... Acknowledgments The authors would like to acknowledge the financial support from the FCT (Portuguese Foundation for Science and Technology) with the associate laboratory contract INESCTEC under grant SFRH ... From Fig. 4 , we also observe that Call-Rank has a degraded detection rate at the SP level compared to Caller-REP system. ...doi:10.1016/j.future.2017.12.026 fatcat:vrp5tcjhlvcalooithuilozgzm