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Telecom Regulatory Authority of India: http://www.trai.gov.in/
Registration process/facility: http://trai.gov.in/WriteReadData/userfiles/file/measuresto%20protectconsumerinterest/03.pdf
National Do Not Call (NDNC) Registry: http://www.trai.gov.in/trai/upload/misc/62/FINALADD.pdf