Telecom Regulatory Authority Of India - Subsection
Section 20(2)(e) in The Telecom Commercial Communications Customer Preference Regulations, 2010
(e)every Originating Access Provider shall ensure use of correct header for sending commercial or transactional message, as the case may be, in accordance with the agreement entered into by the Originating Access Provider with the sender of commercial or transactional message, as referred to in clause (a);