Symptom

When attempting to send SMS to a number in India, the message is undelivered.

Applies To

• Vonage SMS API
• Outbound SMS
• India

Resolution

In some circumstances, you may be able to work around limitations sending SMS to India.

International Users

Request to move to international routing at a higher cost.

Domestic Users

Register your Sender ID. Your Sender ID must be Distributed Ledger Technology (DLT) compliant.

Cause

This issue most often occurs when SMS recipients are registered with India's NDNC (National Do Not Call) list.

Additional Information

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 and Restrictions.