In service tax, there is no difference in rate or treatment for inter-state or intra-state provider and recipient. So, whether the service provider is from outside odisha or from within odisha has no relevance.
Now, if the suppier is providing materials and service, it falls under Works Contract u/s 65B(54) for service tax. It has no bearing on the OVAT laws of the state. For effective rate purpose, kinldy refer Rule 2A of the Service Tax (Determination of Value) Rules, 2006. Kindly also note that if the service provider (SP) is an individual/proprietorship/partnership firm or HUF or AOP and the service recipient (SR) is a body corporate, then reverse charge is applicabe and only 50% of the tax is payable by SP and 50% by SR.