Application to telecom companies: cost accounting rules apply when size thresholds or listing criteria are met. Rule 3 applies the Cost Accounting Records (Telecommunication Industry) Rules, 2011 to every company, including foreign companies, engaged in telecommunication activities where prescribed net worth or turnover thresholds are exceeded or where the company's equity or debt securities are listed or proposed to be listed on any stock exchange; bodies corporate governed by any special Act are excluded.