Telephonic communications – Special services – Repetitive call attempts
Patent
1991-10-01
1993-02-16
Dwyer, James L.
Telephonic communications
Special services
Repetitive call attempts
379144, 379201, 379351, 379355, 379386, H04M 342, H04M 1700, H04M 300
Patent
active
051877406
ABSTRACT:
The invention is an adaptive method and apparatus for telephone call reorigination (i.e., the placement of successive calls without extended re-dialing). It allows shorter, uniform DTMF reorigination requests or commands to be recognized and responded to during certain stages of a call while preserving a filtering effect to avoid "talk off" reorigination during the call's talking stage. In the initial stage of a call, prior to verifying the caller's authority to place the call, a first mode of request detection, responsive to short duration tones is used. During call setup and prior to answer by a called party, a second mode of detection is used which is also responsive to short duration tones. In the talking stage, another mode of detection is used to avoid inadvertent reoriginations due to spurious tones. In one aspect, a dial tone is automatically returned to the caller upon called party disconnect.
REFERENCES:
patent: 4126768 (1978-11-01), Grenzow
patent: 4332985 (1982-06-01), Samuel
patent: 4513175 (1985-04-01), Smith
Eastep Guido M.
Heckman Donald C.
O'Grady Kenneth J.
Swaim Joe T.
Austin Ormand R.
Dwyer James L.
Hong Harry S.
MCI Communications Corporation
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