Interruption of a call between two terminals by a call from anot

Details Interruption of a call between two terminals by a call from anot Interruption of a call between two terminals by a call from anot

1997-07-22

1999-07-27

Wolinsky, Scott

Telephonic communications

Special services

Call waiting

379 9335, 379230, 379373, H04M 342

Patent

active

059303476

ABSTRACT:
A method of interrupting a call established via an analog link between two terminals via a switching center, whether the call is telephonic, telematic or a combination of the two, comprises the transmission of a user alerting signal and a terminal alerting signal from the switching center to one of the terminals. Between these signals the call between the terminals is re-established. To detect the terminal alerting signal the terminal searches during a predetermined period for a pattern transmitted by the switching center comprising in succession a first silence signal with a power less than a predetermined power during a first predetermined period of silence, the terminal alerting signal, and a second silence signal during a second predetermined period of silence.

REFERENCES:
patent: 4852151 (1989-07-01), Dittakavi et al.
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patent: 5287401 (1994-02-01), Lin
patent: 5319702 (1994-06-01), Kitchin et al.
patent: 5406621 (1995-04-01), Binal
patent: 5450485 (1995-09-01), Hamilton
patent: 5539812 (1996-07-01), Kitchin et al.
patent: 5651060 (1997-07-01), Cohn et al.
patent: 5694466 (1997-12-01), Xie et al.
"The Analog Display Services Interface," by Barry K. Schwartz, IEEL Communications Magazine pp. 70-75, Apr. 1993.

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