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.
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
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:
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