Comment on STT Trap - Options Expiry - NSE BSE MCX-SX

Thanks for enlightening us on applicability of STT for option trade during expiry. Thank you for reducing turnover charges for F&O segment.
My query is
In covered call how margin money is calculated. Example: I sold one lot of nifty 5900 call at Rs 200/-. I purchased one lot of nifty 6000 at Rs 150/-. Both the transactions are for same month expiry. Hence no loss occur for any upward movement beyond nifty 6000 points. Maximum loss possible in the above transaction is only Rs 100*50 = 5000/- plus option premium loss/gain. How the margins will be calculated for these transactions.
with regards,
M.Sridaran

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