Defending the decision to slash interconnect rate to 6 paisa a minute, from 14 paisa, starting October 1 and to zero from January 1, 2020, Sharma said in an interview to PTI that the cost of handling calls has been calculated in a transparent manner and the spreadsheets used for doing so are open to scrutiny by anyone.
"We welcome constructive criticism. It is a free country. People have the right to their views. But some criticisms have gone beyond normal criticism. They have questioned the honesty and integrity of the authority, and individuals who are part of authority," he said.
"You may be wise and knowledgeable, technically qualified and an expert in economics or public policy. And it entitles you to have a view, but not to call anyone dishonest. I don't think being wise gives you the right to call anyone dishonest," Sharma said without taking any names.
For the incumbent operators, the charge they collect for allowing a call from a rival network to terminate on their users forms 9 to 15 per cent of their consolidated revenues.
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On the decision to cut interconnection usage charge (IUC), Sharma said the motive behind the move was to compute cost of handling calls in a transparent manner.
"We have maintained that IUC should not become profit centre or profit vertical. We have given excel sheets and method so there should not be any doubt in anyone's mind on transparency." he said.
The criticism had turned into allegations of bias, the Telecom Regulatory Authority of India (Trai) Chief said. "This is not the way to conduct debate or conduct your opinions. It is not correct.. it certainly hurts."
Incumbent telecom operators like Bharti Airtel and Vodafone have cried foul over the regulator slashing call connect charges, saying it will worsen their financial health, and significantly benefit only the new entrant.
Rejecting argument that the new IUC rates will aggravate the financial stress in the sector, Sharma insisted that the two were not related.
"We have merely determined what should be the IUC charges payable and how that can be connected to telecom stress...I am not sure," he said.
"The operators must move to better technologies and that cannot be construed to be favouring A or B technology," Sharma said.
Industry body COAI has said that Trai's decision to cut call connection charge rate by more than half, if executed, will hit earnings of old mobile operators to the tune of Rs 5,000 crore in the current fiscal.
The association has also contended that the assumption of Trai that all operators should move towards VoLTE technology is not practical as it will hit services for 2G users who account for 70 per cent of the total subscriber base in the country.