New Delhi, Aug. 24 -- The final verdict of a 14-year-old legal battle between the country's mobile operators and the department of telecommunications over the definition of 'adjusted gross revenue' is near and may deal blow to debt-laden operators such as Bharti Airtel and Vodafone Idea which are already battling shrinking revenue streams.

AGR is the basis on which department of telecommunications (DoT) calculates levies payable by operators and then it has been a bone of contention in the sector. Telecom operators are liable to pay around 3-5% and 8% of the AGR as spectrum usage charges and licence fees, respectively, to DoT.

The matter has been under litigation for 14 years with operators arguing that AGR should comprise revenue from te...