Hello Mr. Ghosh,
Indiabulls does give the BSE option for the online trade. Their software is optional and it does not work in LAN.
IB is good brokerage firm. Recently I found another firm offering the irrestible offer of Unlimited trading with Zero brokerage - (upfront fee is annual 14000). It is good for traders and high volume grossers.
Taking into consideration the volumes generated such charges for annual brokerage is enticing.
This is from Bajaj. Never heard before in the market thus worth trying.