Telephone line transfer circuit

Details Telephone line transfer circuit Telephone line transfer circuit

H - Electricity

04

M

344/15

H04M 3/58 (2006.01) H04M 1/00 (2006.01) H04M 7/00 (2006.01)

Patent

CA 1053782

ABSTRACT OF THE DISCLOSURE: Transfer of an incoming call on a first telephone line for a first subscriber set to a second, independent telephone line for a second subscriber set is accomplished without per- mitting a party at the first subscriber set to listen to the transferred call. An adjustable time delay circuit causes the tip and ring leads of the first central office telephone line to be switched to the second subscriber set, after a predetermined amount of ringing at the first subscriber set. If the second subscriber set is in use or is being rung at the time a transfer is to take place, no switching occurs. If the first subscriber set is answered before the present time delay is elapsed, no switching occurs. The line transfer circuit may operate from either a -24 or -48 volt DC supply. Upon transfer of the first pair of tip and ring central office lines to the second subscriber set, the second pair of tip and ring central office lines are isolated and terminated with a capacitor suitably chosen to represent a high impedance ringer.

239242

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