question

Mehmood Anjum avatar image
Mehmood Anjum asked Phong Vu answered

SMS-RC-503 while sending A2P message.

We are getting SMS-RC-503 while sending sms from A2P send sms developer reference.
Guide us about steps we can take to fix this.

high-volume sms
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Anirban avatar image
Anirban answered Anirban edited

If you see the error code details: https://ringcentral-api-docs.readthedocs.io/en/latest/messaging/sms/high-volume/handling-errors/

It's written as "RingCentral provisioning error. Phone number is incorrectly provisioned by RingCentral in upstream. "

You can contact Dev support team to fix

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Phong Vu avatar image
Phong Vu answered

Have you used this form to request for A2P number provisioning? If not, please do so. Otherwise, click here to create a support ticket and provide the phone number and your account id or name.

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Developer sandbox tools

Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.

Download RingCentral Phone for Desktop:

Tip: switch to the "sandbox mode" before logging in the app:

  • On MacOS: press "fn + command + f2" keys
  • On Windows: press "Ctrl + F2" keys