Ambani's testimony comes days after the CBI indicted some ADAG officials and a unit for conspiracy, cheating and other offences during a flawed 2008 telecoms licence grant process.
Reliance Communications chairman Anil Ambani today appeared before Parliament's Public Accounts Committee (PAC) which quizzed him for over two hours in connection with alleged irregularities in the allocation of the 2G spectrum.
Ambani, also a former Rajya Sabha member, reached Parliament premises around noon when the PAC was questioning Etisalat DB Telecom CEO Atul Jhamb.
The members asked Ambani to join them just after 1pm and discussions with him continued for nearly two hours.
He was asked questions on issues related to the 2G spectrum allocation as also 3G auction that was held last year.
"He was very free and frank," said a PAC member.
Another member said Ambani referred to the CBI charge sheet in the 2G allocation case and expressed his inability to speak in detail as the matter was sub-judice.
He is understood to have justified the 'first come, first served' policy in the allocation of 2G spectrum and favoured the auction route for 3G spectrum allocation.
Jhamb, who appeared before the PAC along with his senior colleagues from Etisalat DB, was quizzed by members for over two hours. The company officials told the Committee that Shahid Balwa, who is in CBI custody in connection with the 2G scam, was a partner.
S-Tel CEO Shamik Das was also questioned by the PAC while Unitech Wireless Managing Director Sigve Brekke is to appear before it.
The PAC had yesterday quizzed Tata Sons Chairman Ratan Tata and corporate lobbyist Niira Radia in connection with the 2G spectrum scam.
The panel had quizzed Radia, Chairperson of Vaishnavi Corporate Communications (VCC), for two hours and Tata for three hours on issues related to the scam.
A VCC statement later said that Radia had extended her cooperation and offered clarification on all issues to the PAC.
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