When attempting to send SMS to a number in India, the message is undelivered.
- Vonage SMS API
- Outbound SMS
In some circumstances, you may be able to work around limitations sending SMS to India.
Request to move to international routing at a higher cost.
Register your Sender ID. Your Sender ID must be Distributed Ledger Technology (DLT) compliant.
This issue most often occurs when SMS recipients are registered with India's NDNC (National Do Not Call) list.
India is a very complex market as far as regulations are concerned, and if you do not comply with India's regulations, your SMS will not be delivered. Very few numbers in India are not registered with the NDNC register. While you may some SMS delivered, most will be undelivered.
For more information on sending SMS to India numbers, see India: SMS Features & Restrictions.