CBI on Monday, May 30 started minute investigation over the transaction in Mauritius bank between Anil Ambani's RComm and Loop Telecom.
The investigation agency has also demanded to probe 15 other telecom companies which are being suspected
CBI sources claimed to find out the real beneficiaries of the 9.9 percent equity sale by Reliance Communications to Delphi Investment.
The Supreme Court of Mauritius has given a month's time to authorities there to provide all the information to the CBI.
Earlier on the same day, Delhi High Court rejected the bail plea of the owner of Cineyug Film Pvt Ltd, Karim Morani. Morani had been accused of accepting Rs 6 crore kickbacks for assisting the Rs 200 crore transaction from DB Realty to Kalaignar TV.
His earlier anticipatory bail plea on medical grounds was rejected by the special court on May 23 and has been sent to judicial custody.
Meanwhile, the High Court reserved the bail plea order on another prime 2G accused, DMK MP, Kanimozhi. Former Tamil Nadu CM Karunanidhi's daughter is still on remand at the Tihar jail.