www.smsdiscount.com/ is offering very cheap calling to India at 1.5 ct/min. Smsdiscount is cheaper then Intervoip. Smsdiscount and Intervoip are both part of Betamax group.
Smsdiscount also lets users send free text messages all over the world. The Calls to Germany, US, Canada, UK , Norway etc are free while the rates for other international destinations are quite low like India Mobile is just 1.5 ct/min. It also offers VoiP-in number incoming and local access number for convenience.
Like all other Betamax voip applications, smsdiscount voip application is very easy to install and use. The voice quality is great. Download SMS Discount for free here. It Along with PC version, it has both MAC and Linux version too.
Buying credit gives you 120 days of free calls and you can call for 300 minutes per week for free.