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.
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SMS-RC-503 while sending A2P message.
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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