"EGoM will take legal opinion on the decision taken for charging one-time fee for the spectrum that existing operators hold beyond the 4.4 Mhz threshold.
"Also, it will inform AG the circumstances under which these decisions were taken to create level-playing in the industry," a government official aware of the development said.
The EGoM on Monday decided to charge existing players for the airwaves that they were allocated beyond 4.4 Mhz in case of GSM mobile service providers, and above 2.5 Mhz spectrum in case of CDMA operators.
The official said that EGoM has proposed that telecom companies should pay the amount in equal annual installments over a period of 10 years.
"The charges on telecom companies will be levied from the first day of the quarter preceding the date of decision taken by Cabinet. Suppose if Cabinet decides in October or November, then charges will be levied from 1st January," the official said.
In this case, the government will be able to get only Rs 2,700 crore revenue from the one-time fee if spectrum is sold out at reserve price only.
The one-time spectrum fee of Rs 27,290 crore includes the amount that will be charged with both GSM and CDMA technology based service providers for spectrum in 1800 Mhz band, being used for 2G GSM services, and 800 Mhz band which is used for tranmsitting signals for CDMA phones.