"For the quarter of January to March, we are in the final stage of issuing the penalty," Sharma told PTI.
He said that showcause notices have already been issued to erring operators and 21 days have been given for submitting their responses. He. however, did not identify the operators, saying Trai did not want to name and shame any player.
The assessment is based on network performance of operators between January and March, measured against the Trai's new service quality benchmarks.
The "financial disincentive" has already been levied for December 2017 quarter, Sharma added.
Under new rules, call drops are measured at mobile tower level instead of telecom circle level. Trai was of the view that average calculated at circle level may hide many issues.
Trai proposed financial disincentive in the range of Rs 1-5 lakh in a graded penalty system depending on the performance of a network, with stringent fines for repeat violations under the new Quality of Service (QoS) rules.
However, there is cap of Rs 1 million on financial disincentive.
Also, earlier rules did not address temporary issues in telecom network like non-functioning of mobile towers or geographical issues like network quality in an underserved town. Many other parameters too were tightened, and the regulator also fixed benchmark for radio-link time-out technology (RLT) -- purportedly used by operators for masking call drops.
When contacted, industry body COAI's director-general, Rajan Mathews said new QoS rules are among the most stringent globally, and that telecom operators in India have make required investments to ensure compliance with the norms.
"In the December quarter, many operators were marginally non-compliant in some circles...We believe that major players are compliant with the new norms now," Mathews said.