NAP = North American Dial Plan (United States and Canada phone numbers)
SIP Broker only makes calls to NAP toll free numbers. No luck to India or many other countries. For that you must use some Voice Service Provider that supports the destination you are calling (usually only national providers do that).
If the toll free numbers you are trying to dial are not from NAP, then try to find a paid phone number where you can dial.
Regards,
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