you need to have a Indo work permit, they are expensive and take a while to get
It takes about 3 months to process a proper work permit once the company has permission to employ an expat , the cost to process ranges between $500 if running around to he various govt depts is done by company staff to $1,500 if done by an agent plus there is a $1,200 expat tax which has to be paid upfront , so about $1,700 to $3,000
Most people work on their business visas while this is being processed.