Telecom Regulatory Authority Of India - Subsection
Section 2(bg) in Telecom Commercial Communications Customer Preference Regulations, 2018
(bg)"Sender information or SI" means the source, destination and routing information attached to a message or voice call, including, where applicable, the originator's name and originating phone number, reference telephone number, and any other information that appears in the content of commercial communication identifying, or purporting to identify, the sender of the message or making voice call;
