Vodafone, the country's second largest operators in terms of number of subscribers, has termed the Trai's decision as "retrograde regulatory measure".
The incumbent operator in a statement alleged that the move will significantly benefit new entrant alone and would adversely affect the rest of the industry.
Airtel said, "The suggested IUC rate, which has been arrived at in a completely non-transparent fashion, benefits only one operator which enjoys a huge traffic asymmetry in its favour."
The comments come in response to the telecom regulator yesterday announcing cut in mobile call connection charges to six paise a minute, and a complete phasing out of these rates from January 1, 2020, a move that will benefit newcomer Reliance Jio and deal a blow to established players.
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"As part of an industry, which continues to be a critical driving force behind the economic growth in the country, we are genuinely dismayed by this decision," said Airtel, India's largest telecom operator.
Mobile companies currently charge 14 paise a minute for allowing a domestic call from a rival operator to terminate on their network. This charge, called Interconnection Usage Charges or IUC, will be brought down to six paise per minute from October 1, 2017, TRAI has said.
Cellular industry association COAI has termed the move "disastrous", and warned that most of its members will take legal recourse on the issue, to protect their financial interests.