Troubleshooting the SMS REST API

Here are few things you can do if you encounter an error with the SMS REST API:

1. Check that the HTTP request is authenticated correctly .
2. Look up the error code using our HTTP error codes table which contains troubleshooting steps.
3. Ensure you're using all of the required parameters.
4. If you're using one of our SDKs, ensure the dependencies are available and referenced correctly.
5. Check that your callback URL is correctly configured and working properly.
6. If you have multiple service plans, check that the service plan ID selected matches the credentials in your call .
7. If you're testing, make sure the number you're testing with is verified in the Sinch Customer Dashboard .
8. Ensure you're sending from a Sinch number . Either your test number or a rented number.

Useful support articles

We also have a library of help articles that can point you in the right direction. Here are a few that may be useful for troubleshooting:

• Why wasn't my message delivered?
• What features and restrictions are there for sending messages to different countries?
• My delivery receipt shows successful, but my message did not deliver – what’s going on?
• Why is my sender ID not delivering?
• How can you check the delivery statuses of your SMS?

Find SMPP error info here. And find 10DLC (US number related) error info here.