New Delhi (Agencies): It was face-to-face confrontation between ADAG Chairman Anil Ambani and former Telecom Minister A Raja at CBI headquarters over the matter of Dual Technology permit to RCom and its alleged connection with Swan Telecom.

The investigating officials repeatedly questioned the duo on Wednesday evening over the equity issues of Swan telecom for about an hour but both remained "non-cooperative" and stuck to their stand, sources privy to the probe said on Thursday.

The questions pertained to whether Reliance Communication directly or through its subsidiary held above 10 per cent equity, a threshold for cross-holding in two services providers in the same circle, the sources said.

Swan Telecom, in which Tiger Traders Private Limited has 90.13 and Reliance Telecom Limited has 9.87 per cent equity share capital, has been under the scanner over alleged diversion of funds to DMK-owned Kalaignar television.

Ambani, 51, was called to the CBI headquarters on Wednesday for probing by the agency in connection with the 2G Spectrum scam.

DB Realty group managing director and promoter of Swan telecom Shahid Usman Balwa is already in the CBI custody.

The CAG said four companies including Reliance Communications Ltd were provided CDMA based mobile service under Unified Access Service licence.

Based on the recommendations of TRAI, utilisation of dual technology was allowed on October 17, 2007 and RCom is accused to have applied for the same even before the declaration of the policy.

Reliance Communication Ltd had complied with the requirements for consent to use dual technology on October 19, 2007 itself by depositing the non refundable entry fee of Rs 1,645 crore for 20 service areas through Reliance Infocomm Ltd.

The CAG had said that acceptance of bank draft from Reliance Infocomm Ltd (third party) on behalf of Reliance Communications Ltd was not in order and showed the rush in which the entry fee was deposited.

In a statement here, ADAG had on Wednesday said, "during the course of his weekly visit to New Delhi, Ambani "met CBI officials to clarify ongoing issues, relating to telecom matters for the years 2001 to 2010".

The ADAG statement stated, "neither Reliance Telecom nor RCOM nor any Reliance ADAG individual, company or affiliate held even a single share in Swan Telecom Ltd at the time of grant of the 2G licence to them in January, 2008, or at any time thereafter".