"Government has decided to conduct special audit for three subsequent financial years 2008-09, 2009-10 and 2010-11. The process is under way," Prasad said in a written reply to the Rajya Sabha.
Prasad said that the government conducted special audit of five major telecom companies in 2009 for financial year 2006-07 and 2007-08.
"On the basis of this special audit demands for Rs 1,846.51 crore was issued. All the demands were challenged in the courts by telecom companies...These demands are subjudice till date," Prasad said.
The financial impact due to understatement of gross revenue stood at Rs 1,507.25 crore for Reliance Communications, Rs 1,357.68 crore for Tata Teleservices, Airtel (Rs 1,066.95 crore), Vodafone (Rs 749.85 crore), Idea (Rs 423.26 crore) and Aircel (Rs 107.61 crore), the CAG said.