Method of and apparatus wherein a telephone user on hold is...

Telephonic communications – Centralized switching system – Call distribution to operator

Reexamination Certificate

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Details

C379S201020, C379S215010, C370S354000

Reexamination Certificate

active

07136479

ABSTRACT:
A telephone user who is at a first telephone station and is placed on hold at a second station is prevented from listening to an objectionable audio signal while a call is in process between the user and the second telephone station. The objectionable audio signal is detected while the call is in process and the user is prevented from hearing the objectionable audio signal while the objectionable audio signal is being detected. In response to detection of the end of the objectionable audio signal, the user is coupled to the second telephone station.

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patent: 63-59244 (1988-03-01), None
patent: 2-16850 (1990-01-01), None
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patent: 3633 (1994-05-01), None
Patent Abstracts of Japan, Pub. No.: 63-059244, Date of Pub. Mar. 15, 1988, http://www1.ipdl.jpo.go.jp/PA1/result/detail/main/wAAAa25503DA363059244P5.htm.
Patent Abstracts of Japan, Pub. No.: 02-016850, Date of Pub. Jan. 19, 1990, http://www1.ipdl.jpo.go.jp/PA1/result/detail/main/wAAAa25503DA402016850P4.htm.
Kang, Shin-Hak, KR9404471B1: Automatic Switching Circuit of Music Signal, Issued May 1994, http://www.delphion.com/details?&pn=KR09404471B1.

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