Service tax for IT service provided abroad

Hi

I am planning to provide IT & Consulting service through a proprietorship firm. Here most of my customers will be from abroad. The companies from abroad converts the amount in INR and I will receive money in INR via NEFT

1. Will the rate of service tax be same (as in 12.36%) for both clients as in domestic or international or will it be consider as Export of Services.

2. Is there any benefit if I charge & receive the amount in USD instead of INR