Service tax registration-multiple premises


(Guest)
An ad agency having 2 place of business, one in J&K and other in Delhi.. Has to apply for Service Tax Number. What should be the best option?1. Doing Centralised Billing and accounting frm J&K and do not get regd under service tax laws?or 2. Not doing Centralised Billing but having decentralized system and obtain Service Tax Number for Delhi Office?