Finally, CBI had filed a preliminary inquiry in the case in 2011, they said.
The sources said these lines were not ordinary telephone lines but costly ISDN, capable of carrying huge data thus facilitating faster transmission of TV news and programmes across the globe.
CBI in its report to the Telecom Secretary had alleged that these lines were for use of large commercial enterprises to meet special needs such as video conferencing or transmission of huge volume of digital data for which heavy fee is charged but Sun TV got it for free.
