Hello Ryan,
The ban for voip was removed on April 1, 2002.
The following article gives some detailed information on this:
http://pib.nic.in/feature/feyr2002/fapr2002/f160420021.html
I hope there are established guidelines published by the Department of Telecommunications (DoT), but its site (www.dotindia.com) is not accessible at this moment. For now you could try digging around in the Ministry of Comminications and Information Technologies site:
http://www.mit.gov.in/
Good luck,
-ben
