Telephonic communications – Multi-line or key substation system with selective switching... – With intercom system
Reexamination Certificate
1997-12-22
2001-05-15
Tsang, Fan (Department: 2645)
Telephonic communications
Multi-line or key substation system with selective switching...
With intercom system
C379S030000, C379S088010, C379S160000, C379S167050
Reexamination Certificate
active
06233328
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an automatic door answering system in accordance with the type stated in the main claim.
2. Description of the Related Art
Door intercom circuits already exist which operate in conjunction with a telephone installation. With such systems a button is pressed on the telephone apparatus, enabling the door intercom system to be monitored. In this case, the telephone apparatus, which can also be used for long distance calls or internal calls on an in-house system, replaces the call station of the door intercom system installed in the building. Because such systems lack the necessary logistics, they do not enable a check to be made on callers at the door, or for such calls to be monitored or recorded.
SUMMARY OF THE INVENTION
The present invention overcomes these drawbacks of the prior art. Specifically, an automatic door answering system according to the present invention advantageously takes the form of a compact module that can switch between a door intercom system, a recording device and a telecommunications system, has separate interfaces with the door intercom system, recording device and telecommunications system, and uses a microprocessor-assisted control system to achieve active selection between the interfaces. The door intercom may have an umber of call buttons, allocated to various different stations such as telephone connections. In particular, the switching device switches connection of the door intercom system between the recording machine and the telecommunication system. Operating the call button on the door intercom automatically activates the door answering system, dialing the appropriate connection. At the same time a message is played to the person using the answering system. The recipient can then take the call and speak with the caller. If the recipient does not deal with the call personally, the door answering system will activate the recording device, enabling the caller to leave a message. However, all calls at the door are registered, together with the time of the call, enabling calls to be monitored. The recording device can be accessed by telephone. The door answering system is suitable for both commercial and private use. Typical applications include companies, office buildings staffed by a doorman, emergency services and hotels.
A further advantage of this invention consists of the fact that the door answering system does not require any drive mechanism or mechanical parts. Because it is electronically operated, it is not subject to wear. Furthermore, the door answering system is extremely compact.
Another benefit of the entry management system is that it can be easily programmed without the need for ancillary equipment.
The following description, drawing, and claims also indicate some of the other advantages of this invention and of its developments.
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ETA-2006 ETS2006 FAX Bedienhandbuch zu den Elektronischen Telefon-Systemen, Auerswald GmbH & Co. KG undated brochure.
Boyle Fredrickson Newholm Stein & Gratz S.C.
Hoosain Allan
Tsang Fan
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