The apex court last month upheld the government's position on including revenue from non-telecommunication businesses in calculating the annual AGR, a share of which has to be paid as licence and spectrum fee to the exchequer.
The revenue of TTML declined by about 16 per cent to Rs 270.35 crore during the reported quarter from Rs 321.84 crore in the corresponding quarter of 2018-19.
Though the company has demerged its consumer mobile business, the Department of Telecom has not taken the same on record.
"The Company understands that DoT has filed Special leave Petitions against BAL (Bharti Airtel) in Hon'ble Supreme Court challenging interim orders of TDSAT," TTML said in a note.
Shares of TTML closed at Rs 2.71 a unit, down by 3.56 per cent compared to previous close, at the BSE on Friday.
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