Though there are some companies set up in India who allows to buy / sell bitcoins in Indian Rupees, its still not clear whether its legal or illegal or what kind of tax or service tax attracts.
India is yet to publish any regulatory framework over bitcoin, and there are anticipations that, we may have to pay GST ( Goods And Services Tax), or Capital Gains Tax over the gain. Sometimes back Reserve Bank of India had warned against Bitcoin, but despite that, these new companies have set up and providing their service.
So right now neither they are legal nor ille gal. So its up to the person to decide, what to do. None of the sites say anything about these.
I wish the Govt at least publish some clarity or guidelines as the best time to invest in bitcoin is coming.