Not satisfied with the responses submitted by Bharti Airtel and Vodafone Idea on its priority plans, regulator Trai has shot off additional “technical” queries to both the telcos and asked them to explain their stand on August 4, a source said.

The Telecom Regulatory Authority of India (Trai) wants the two companies to substantiate their claims that the contentious priority offerings, which are under the regulator’s lens, have neither deteriorated the experience of other network users nor violated any rules.

Another source said that Bharti Airtel has been asked over two dozen questions, including if limits for data speeds have been set for platinum and non-platinum users, and about the levels of throughput for platinum users.

Trai sent out fresh set of questions to both Bharti Airtel and Vodafone Idea on July 31, and the operators have been asked to respond to the questions on August 4.

Emails sent to Bharti Airtel and Vodafone Idea did not elicit a response.

Trai has said it is desirable that the points raised in the questionnaire be covered in a presentation scheduled on the issue on the same day. The regulator has asked the companies to back their claims via data, the source said.

A Trai official said that the previous responses received from companies were “vague” and gave no real assurance to address regulator’s concerns over whether network preference to specific customers resulted in deterioration of services for other non-premium subscribers.

The regulator wants the companies to demonstrate certain claims made by them that there is no adverse impact of the said premium/platinum plans on network experiences of general customers.

Earlier this month, the two telcos responded to Trai’s previous round of questioning where they vehemently defended their priority plans, and argued that the offers have neither degraded network experience of non-premium users nor flouted any regulations. They said the subscribers of the plans constitute only a small portion of overall customer base.

In a letter to Trai, Vodafone Idea had said the benefit featuring network priority “is fully compliant to all applicable tariff orders and regulations” and that “Trai has prejudged and prematurely concluded poor network service”.