| CPC H04L 12/2827 (2013.01) [G07C 9/00 (2013.01); G07C 9/00571 (2013.01); G07C 9/00904 (2013.01); G07C 9/37 (2020.01); G08B 3/10 (2013.01); G08B 15/00 (2013.01); H04L 12/2818 (2013.01); H04L 12/2825 (2013.01); H04L 12/40169 (2013.01); H04L 12/4625 (2013.01); H04M 3/42348 (2013.01); H04M 11/025 (2013.01); H04M 11/04 (2013.01); H04N 7/185 (2013.01); H04N 7/186 (2013.01); G06V 40/70 (2022.01); H04L 2012/2841 (2013.01); H04L 2012/2849 (2013.01); H04N 5/144 (2013.01); H04N 23/69 (2023.01)] | 20 Claims |

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1. A method for using a doorbell to detect a presence of an outside visitor and a presence of an inside visitor, the doorbell having a speaker, a microphone, a camera, and a button, wherein the button is configurable to enable the outside visitor to sound a chime, the method comprising:
using the doorbell to detect the presence of the outside visitor, by detecting a remote computing device associated with the outside visitor, while the outside visitor is located outside a building to which the doorbell is attached, wherein the building comprises a door having a lock that is configured to fasten the door to inhibit unauthorized entry into the building; and
in response to detecting the presence of the outside visitor, using the doorbell to detect the presence of the inside visitor, in connection with comparing selected facial features from an image taken by the camera to a facial database, while the inside visitor is located inside of the building.
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