Margin Requirement

dear all,
i do trading in option, my trading a/c is with icici and religare.

if i sell nifty call or put of strike prise of 4000 they demand margin of rs 40000

and
if i sell nifty call of strike prise of 4200 and sell nifty put of strike prise 3900 they demand margin FOR BOTH ie 42000+39000=81000, however for both transaction at same time margin requirement according to margin calculator comes very low ie near to 40000

is any broking house demand margin according to margin calculator,

pl guide me

some times broker may ask fore more margin but u should trade through more flexible broker

Are there any option friendly brokers here? Do list if any.

angel broking or rk global

Kavathiya,

Do they charge single margin on a straddle/ strangle or is it for 2 contracts like all other ignorant brokers ?

Is brokerage competitive?

is there any margin calculator for Indian markets available online? is seller of a future entitled to get credit of the initial margin?

what will be margin requirement if i
buy Nifty July Fut @ 4560 and
sell Nifty Aug Fut @ 4570

what will be margin requirement for above position [ considering lot size of 50 shares per lot ]?