The Central Bureau of Investigation (CBI) has questioned Nripendra Misra, former chairman, Telecom Regulatory Authority of India (TRAI), in connection with the 2G spectrum allocation issue, according to news reports.

Misra, who was also the secretary in the telecom ministry, had taken over the chairmanship of TRAI from Pradip Baijal in 2006.

The IAS officer was questioned in detail with regard to the policy and other issues relating to the spectrum allocation policy, it is believed.

Misra had reportedly written to the then telecom secretary in January 2008 objecting the first-come-first-serve policy adopted by the department in the allocation of 2G spectrum to new operators without specifying its availability.