Abstract: A system enables a scheduled visitor to receive an optical credential in paper or electronic form, and a range of date-time validity for a video doorbell which may actuate a portal. Upon activation the video doorbell hashes the optical credential with a range of date-times of the actual access request. The range of most significant bits of date-time at the doorbell causes the hashing to produce a plurality of digital bit-keys. The plurality of bit-keys generated exclusively at that video doorbell at that time would be verified with a stored digital bit-lock which is a complementary transformation of the valid date-time range hashed with the original optical credential at a visitor filtration server. Overwriting a stored digital bit-lock in a video doorbell at any time effectively cancels access by that optical credential.

Abstract: A system enables a scheduled visitor to receive an optical credential in paper or electronic form, and a range of date-time validity for a video doorbell which may actuate a portal. Upon activation the video doorbell hashes the optical credential with the date-time of the actual access request, masked to a range of most significant bits to create a plurality of digital bit-keys. The bit-keys generated exclusively at that video doorbell at that time would be verified with a stored digital bit-lock which is a complementary transformation of the valid date-time range hashed with the original optical credential at a visitor filtration server. Overwriting a stored digital bit-lock in a video doorbell at any time effectively cancels access by that optical credential. An emergency access key phrase communicatively couples the video doorbell with a visitee interview panel overriding access policies. Installation of custom software on the visitor's terminal is unnecessary.

Abstract: A camera reboots when a first timer or counter expires but defers when a connection enables a server to reset the first timer or counter. A connection is initiated when a second timer or counter expires in the event of idleness. Both timers can be compared with current system time to cause reconnection or reinitialization.

Abstract: A camera reboots when a first timer or counter expires but defers when a connection enables a server to reset the first timer or counter. A connection is initiated when a second timer or counter expires in the event of idleness. Both timers can be compared with current system time to cause reconnection or reinitialization.

Abstract: A system enables a scheduled visitor to receive an optical credential in paper or electronic form, and a range of date-time validity for a video doorbell which may actuate a portal. Upon activation the video doorbell hashes the optical credential with the date-time of the actual access request, masked to a range of most significant bits to create a plurality of digital bit-keys. The bit-keys generated exclusively at that video doorbell at that time would be verified with a stored digital bit-lock which is a complementary transformation of the valid date-time range hashed with the original optical credential at a visitor filtration server. Overwriting a stored digital bit-lock in a video doorbell at any time effectively cancels access by that optical credential. An emergency access key phrase communicatively couples the video doorbell with a visitee interview panel overriding access policies. Installation of custom software on the visitor's terminal is unnecessary.

Abstract: A camera reboots when a first timer expires but defers when a connection enables a server to reset the first timer. The system uses a visitor filtration apparatus to encode and store time-windows for expected visitors and generate optical credentials as visitor indicia and policies to greet, transform messages, and determine various access to visitors, both expected or unexpected. A video doorbell component of the system triggers on image or audio capture, transforms and verifies optically encoded credentials and actuates a physical access control actuator, triggers a visitor filtration apparatus, or relays images and audio with an interview panel. The optical credential is transmitted electronically to an expected visitor and may be printed or displayed from an electronic media.

Abstract: A camera reboots when a first timer expires but defers when a connection enables a server to reset the first timer. The system uses a visitor filtration apparatus to encode and store time-windows for expected visitors and generate optical credentials as visitor indicia and policies to greet, transform messages, and determine various access to visitors, both expected or unexpected. A video doorbell component of the system triggers on image or audio capture, transforms and verifies optically encoded credentials and actuates a physical access control actuator, triggers a visitor filtration apparatus, or relays images and audio with an interview panel. The optical credential is transmitted electronically to an expected visitor and may be printed or displayed from an electronic media.

Abstract: A system uses a visitor filtration apparatus to encode and store time-windows for expected visitors and generate optical credentials as visitor indicia and policies to greet, transform messages, and determine various access to visitors, both expected or unexpected. A video doorbell component of the system triggers on image or audio capture, transforms and verifies optically encoded credentials and actuates a physical access control actuator, triggers a visitor filtration apparatus, or relays images and audio with an interview panel. The optical credential is transmitted electronically to an expected visitor and may be printed or displayed from an electronic media. Policies enable recognition of biometrically enhanced images of faces or faces with uniform hats such as emergency services agents. Messages are stored for replay or transmitted immediately.