Telephone apparatus

Details Telephone apparatus Telephone apparatus

1990-07-25

1991-07-09

Schreyer, Stafford D.

Telephonic communications

Multi-line or key substation system with selective switching...

Switching or supervision feature

379160, 379164, 379167, H04M 172

Patent

active

050312103

ABSTRACT:
A telephone with an inter communicating facility is disclosed. The telephone has: a condition storage unit for storing operation condition data; an operation process unit for, when the operation of a hold key is detected, making the condition storage means to store the operation condition data indicative that the telephone holds a telephone line; and a condition control unit for, when the condition storage unit stores the data indicative that the telephone line is held, making a holding unit to hold the telephone line. When the operation of an extension call key is detected, the operation process unit makes the operation condition data indicative that the telephone is calling another telephone connected through an extension line to be stored in the condition storage unit, and makes a command transmission unit to transmit an extension call signal through the extension line. When the operation of a hook switch is detected, the operation process unit makes data indicative of the transfer state to be stored in the condition storage unit, and makes the command transmission unit to transmit the transfer command through the extension line.

REFERENCES:
patent: 4490583 (1984-12-01), Bednarz et al.
patent: 4821319 (1989-04-01), Middleton et al.

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