Two-line telephone controller with hold feature

Details Two-line telephone controller with hold feature Two-line telephone controller with hold feature

1996-03-14

1999-09-28

Chang, Vivian

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379162, 379163, 37910012, H04M 1100, H04M 100

Patent

active

059600659

ABSTRACT:
In a two-line telephone controller which includes a line select switch which operates complementarily to a force busy relay that allows an unselected telephone line to be forced to a busy state, a method for using the force busy relay also to place an active line on hold. The method includes detecting an incoming call on an inactive line, switching the line select switch to the inactive line, receiving an instruction to place the active line on hold, and responding to the hold instruction by closing an off-hook relay so as to connect the force busy switch across the active telephone line, opening a first handset select switch for the active telephone line, and closing a second handset select switch so as to select the incoming call on the ringing line. Because the force busy switch is connected across the formerly-active telephone line, loop current is maintained, thereby placing and maintaining the formerly-active call on hold.

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