The telecom department wants auditors to check the billing to post-paid customers, revenue from broadband subscribers, billing to internet data centre, sale of SIM card/recharge/e-recharge, sale of handset, revenue from leasing of infrastructure and so on.
Besides, the auditor would also look into the collection from the installation fees, late fees, sale proceeds of handsets, revenue on account of interest, dividend, value-added services, roaming charges etc (as part of gross revenue).
The DoT has also asked auditors to find out more about configuration of tariff plans in the billing systems and discrepancies in call duration and charges.
The special audit was triggered by a 2017 report of the Comptroller & Auditor General of India (CAG). The report said a clutch of telecom companies were found to have understated revenues by more than Rs 61,000 crore over a period of five years, resulting in a short payment of nearly Rs 7,700 crore in statutory dues to the government. The telcos were Bharti Airtel, Vodafone, Idea Cellular, Aircel, Sistema Shyam Teleservices, and Reliance Communications. Other than these, Tata Teleservices, Telenor, Videocon Telecom, Quadrant Televentures, and Reliance Jio Infocomm were also mentioned in the CAG report. These firms understated their adjusted gross revenue (AGR) by over Rs 14,800 crore, resulting in a shortfall of Rs 1,526.70 crore to the government, according to the report.