Query related with service tax on web development

Dear Sir,

I am running a website development & Maintance firm in the form of Pvt. Ltd. Compamy. My most of business iss outside india and also money is coming from foreign sources. But my few business is also in india.

So, my query is that what rate of Service Tax will charge on invoice in india and in which which categrory (Accounting code) will applicable for payment of service tax?

Rajan Aggarwal