You can make free calls from GTalk. However it can not be used in india at this time.For making free calls follow the steps given below.
- Open google talk on your desktop
- Click the add button to add number
- Type in the phone number of the person you want to call in the following format.
Use full phone number, including country code and area code:
ph-number@talkster.gtalk2voip.com (example USA,use 12125551212@talkster.gtalk2voip.com - If you’ve entered a valid number, it will be added to your contacts list and you will be able to make free calls to that number any time later.
You can check Supported countries