We temporarily export encrypted electronic devices (mobile phone & tablets) in many countries for use in clinical trials, India is proving to be a challenge and it is not clear in relation to BIS. We are looking for expertise in this area, do all devices need to be registered for temporary import? Some information we are aware of, such as devices have to be new and to include the correct paperwork.
I hope you get an answer to your question shortly.
In the meantime, I recommend also looking at the Institute of Export and International Trade’s helpdesk for more specific advice: