Anil Ambani-promoted Reliance Communications (RCom) on Wednesday lambasted the department of telecommunications (DoT) for its decision to follow the regulator's method for allotting spectrum or airwaves to operators. "DoT succumbs to private GSM operators' pressure tactics. Concessions to GSM operators are unnecessary and unwarranted," said Gaurav Wahi, spokesperson of RCom, in a statement in New Delhi.