Gupta, a principal adviser with TRAI, has been elevated to the post of Secretary.
"He (Gupta) is now new Secretary and has assumed the charge from today," a TRAI official said.
In the past 10 years at TRAI, Gupta has a played a key role in almost all the key regulations, recommendations and directions. This include mobile number portability regulation, rules to curb pesky calls, quality of service standards.
Gupta's major works include staring with spectrum management and licensing framework which has formed the basis of new licensing regime.
He has been responsible for formulating recommendations related to spectrum auctions, 3G and later BWA spectrum auctions. These two had helped government garner over Rs 1 lakh crore.
Gupta had also worked with MTNL.