like China, Both india and China do not allow margin calls trading. in China, there seems like a grey area for this, seems no clear policy to prohibit it now. however, banks are monitoring the money coming and may decline if it's for forex trading,
and some lawyers say it is illegal if investment companies who promote forex business in china without license from the government will violate forex management rules , if the clients margin exceed a certain level, it will even violate criminal law,
but i think it's still controversial, i am not pretty sure about this.