Attention: The security certificate on some deskphones expired on August 16, 2024. RingCentral updated them, but if your phone isn’t working, it may be because the update failed. To get your phone working again, you’ll need to factory reset it and set it up again.
This article describes the fifth (final) step you need to complete when setting up your Analog Telephone Adapter (ATA) for sending and receiving faxes.