The government has asked Tatas why a penalty of Rs 50 crore should not be slapped on them for illegally offering 'push-to-talk' service, which could have led to breach of national security.Department of Telecom (DoT) has given a month's time to Tatas to explain why the penalty should not be levied for violating the licence conditions under which the company was offering PTT services which is otherwise a part of voice telephone licence. A Tata spokesperson said: "we are yet to receive the notice."DoT has said the frequency used by Tatas' ISP licence was originally alloted to the company for unified access service, and this has led to violation of the licence terms and conditions.
