Are you talking about the RC app, RC soft phone app or your own app?
When asking questions, pls provide little more background or as detailed as possible so people can help.
Are you using API to initiate the inbound call (ring out or callout? ). What device type are you using to receive the calls?
Can you check if you have enabled DND status ?
Can you check your Call Handling and Forwarding rules on service.ringcentral.com and verify If that's correct?
You can reach out to RingCentral's Techsupport team for further assistance if you are not using any APIs or API integration products : https://support.ringcentral.com