Telecom Regulatory Authority Of India - Subsection
Section 18(c) in The Telecom Unsolicited Commercial Communications Regulations, 2007
(c)that in case I/We am/are required to make an unsolicited commercial communication to any subscriber whose telephone number does not appear on the National Do Not Call Register, such communication shall be prefixed with the following text in English or Hindi or regional language with which the recipient of the message is conversant:-
