James,
Sounds like you are happy with Ring Central. Updox charges you for incoming & outgoing faxes. It can add up quickly.
If you have a Brother MFC, you can leave it connected as your fax machine. You can set it up to have incoming faxes saved to the "SEND TO UPDOX" folder and they automatically get imported into UPDOX and will not count against your incoming faxes.
Just an FYI
