The rating agency added that while there has been already increase in tariffs in last few months, the signs of clarity in policies will add to its growth. "Our estimates show there is still a 50 per cent gap between headline tariffs and ARPM (average revenue per minute) due to discounted call rates offered to many subscribers. With competitive intensity easing, telcos are in a better position to reduce the discounts and crunch the gap," CRISIL Rating's Senior Director Sudip Sural said in a statement. Recently, financial major Nomura had also said that telecom major Bharti Airtel may increase mobile call rates by 10 to per cent. Airtel said that it has no plans to increase headline tariff, which is amount charges to mobile subscribers when they are not covered under any scheme. CRISIL is of the view that the sector's pricing power will sustain over the next 2 to 3 years.