Use of public subscriber telephone network; method and apparatus

Details Use of public subscriber telephone network; method and apparatus Use of public subscriber telephone network; method and apparatus

1974-06-03

1976-03-30

Olms, Douglas W.

179 1H, 179 39, H04M 1108

Patent

active

039476413

ABSTRACT:
Chiefly by means restricting/specifying the telephone numbers possible to dial from a door-attached and else to its purpose adapted telephone, a normal public automatic subscriber telephone network in its entire ordinary functioning and capacity of communication is being used in the specific order to establish a well defined door to tenant communication situation in a house of such a door telephone, enabling a visitor to call up a tenant and seek admission through the locked door, time-limitable conversation between them, and tenant to open the door free of choice. The functioning is specific for each house, yet no extra installations or arrangements in the common telephone network or in the house are needed, but the door telephone beeing conventionally connected with the existing telephone network can without measures share its regular and new, anyway for general purposes introduced extra services to distinguish the function. Thus extra features like particular ringing and overcoming of busy line are thereby provisionable, protection against misuse is obtained, and can the door in a house that so wishes be opened from an outside distance when so called for by post men, emergency personell and the like.

REFERENCES:
patent: 3322904 (1967-05-01), McCay et al.
patent: 3484561 (1969-12-01), Matthews
patent: 3557318 (1971-01-01), Buonsante et al.
patent: 3727007 (1973-04-01), Catlin
patent: 3784757 (1974-01-01), Woolf et al.
patent: 3798381 (1974-03-01), Piacente et al.
patent: 3816662 (1974-06-01), Shaver et al.

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