Automatic call screening telecommunication device

Details Automatic call screening telecommunication device Automatic call screening telecommunication device

1997-08-27

2000-08-08

Hong, Harry S.

Telephonic communications

Call or terminal access alarm or control

379211, 379201, H04M 300

Patent

active

061012491

ABSTRACT:
A selective ring response device for a telecommunication line comprises: a ring tone detector circuit for detecting a special ring tone different from a standard ring tone, the ring tone detector circuit coupled to the communication line; an interface circuit capable of placing the communication line in an off-hook status and capable of selectively applying a switch hook flash signal to the communication line, the interface circuit coupled to the communication line; and a control circuit coupled to the ring tone detector circuit and the interface circuit, wherein the interface circuit places the communication line in the off-hook status, and at the user's request applies the flash hook signal to the communication line in response to the ring tone detector circuit detecting the special ring tone.

REFERENCES:
patent: 5394445 (1995-02-01), Ball et al.
patent: 5548636 (1996-08-01), Bannister et al.
patent: 5712902 (1998-01-01), Florence et al.
patent: 5757889 (1998-05-01), Ohtake
patent: 5835573 (1998-11-01), Dee et al.
Bellcore GR-1512-CORE, Issue 2, Oct. 1994, A Module of LSSGR. pp. 1, 5 and 15.

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