Title:
TELEPHONE EXCHANGE SYSTEM
Document Type and Number:
Japanese Patent JPH05207540
Kind Code:
A
Abstract:
PURPOSE: To attain reply without use of a telephone set.
CONSTITUTION: A telephone exchange A selects and forms a channel between an external line and an extension L2 or between extensions L2 and a telephone set C is used to make external line talking and extension talking. A telephone receptacle B is provided with a voice talking device comprising a speaker SP, a microphone MC and a hybrid circuit 30. In the case of simultaneous talking, a cross point switch, is used to form a channel between the caller extension L2 and the called control line L3. A speech circuit 29 is provided to the channel to attain 2-way talking between the extension L2 and the control line L3.
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Inventors:
KATA HISAO
Application Number:
JP1254592A
Publication Date:
August 13, 1993
Filing Date:
January 28, 1992
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
H04M1/00; H04M1/60; H04M1/738; H04Q3/58; (IPC1-7): H04M1/00; H04M1/60; H04Q3/58
Attorney, Agent or Firm:
Ishida Chochichi (2 outside)