In a major setback to telecom companies, the Delhi High Court on Monday held that the Comptroller and Auditor General (CAG) can audit the revenue-sharing details of private firms like Reliance Communications Ltd, Bharti Airtel, Tata Teleservices, Idea Cellular Ltd and others to check under-reporting of revenue for calculating the licence fee - judgment strengthens Arvind Kejriwal's AAP (Aam Aadmi Party) stance of CAG audit of power companies.br A bench comprising justices Pradeep Nandrajog and V Kameswar Rao allowed "the CAG to conduct revenue audit" of the telecom service providers.