there are not too many players having the Internation Bandwidth...in addition to VSNL and Reliance, the third one is Sify and may be Spectranet as well, but i'm not sure about that...so basically, whichever ISP u're having, the main providers are them only...so basic thing which differentiate one ISP from another is the CC and infrastructure...the company may be a BIG one with BIGGER infrastructure, but not necessarily the best CC and the BIGGEST example is Sify 😉