I asked a similar question a few months ago and got similar replies. Technically, you may be required to get a business visa, but the chances of Indian officials catching you are practically zero, unless by a stroke of some bad luck you happen to be in the vicinity of some suspects, there is a terrorist incident during the time of your stay in India in the cities you plan to visit, and there is a paper trail of your activities,. or you yourself use your meetings with your business colleagues as an alibi.