One blue and one yellow LED means that the “Allow All Calls” setting is enabled. This means all Greenlist and Greylist callers can make your phone ring. Redlist callers will still be blocked.
You know this setting is enabled if the button is black with white writing. You can disable this setting in the imp app by going to the “Devices” page.
On the same “devices” page, you also have settings for “Do Not Disturb,” which allows you to block all incoming calls. There is a caveat that if urgent calls are enabled and a caller triggers the requirements, they will make the phone ring, even with “Do Not Disturb” active.
For more on urgent call settings click here.
Click here to see the full LED guide.