Secure entry system with acoustically coupled telephone interfac

Details Secure entry system with acoustically coupled telephone interfac Secure entry system with acoustically coupled telephone interfac

1991-12-05

1993-09-14

Dwyer, James L.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

70 63, 70271, 2353825, 34082531, H04M 1100

Patent

active

052456528

ABSTRACT:
A comprehensive real estate lockbox system is disclosed which provides a variety of operational features. One of these includes a reader key that can retrieve access data from a system lockbox. The reader key is provided with an audible tone generator which can be selectively enabled by the user. The tone generator can be used to download data from the reader key over telephone lines.

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