New Delhi, Jan. 2 -- The Telecom Regulatory Authority of India (TRAI) has approached the Supreme Court against a TDSAT order that set aside the regulator's predatory pricing tariff rules, said Union Communications Minister Manoj Sinha on Wednesday.

In a written reply to the Lok Sabha, the Minister said that the appeal is yet to be listed in the apex court.

On December 13, the the Telecom Disputes Settlement and Appellate Tribunal (TDSAT) had dismissed TRAI's order dated February 16, 2018 on predatory pricing due to lack of "transparency".

As per the TRAI rule, a tariff could be predatory only if an operator with over 30 per cent market share offers tariffs lower than the average variable cost. TDSAT's order struck down this rule.

"TRAI ...