Telephone

Details Telephone Telephone

1999-04-20

2000-11-21

Nguyen, Duc

Telephonic communications

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

379163, 379164, 379420, H04M 100

Patent

active

06151389&

ABSTRACT:
A telephone, which includes a CPU connected to a keyboard thereof, a first switch connected between first and second telephone lines, second and third switches provided at the first and second telephone lines and connected to the CPU, the second and third switches each having a first contact at the respective output end connected to a fourth switch and a second contact connected to a fifth switch, which controls a hand-free circuit, wherein when the first and second telephone lines are called at the same time, the switches are controlled by the CPU for enabling a first user to pick up one call through the hand-free circuit or talking circuit and a second user to pick up the other call through the talking circuit or hand-free circuit, and a switching can be made through the keyboard to change the connection of the telephone lines between the talking circuit and the hand-free circuit.

REFERENCES:
patent: 5590185 (1996-12-01), Sandler et al.

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