Telephone message transfer circuit

Details Telephone message transfer circuit Telephone message transfer circuit

1974-04-01

1976-01-20

Claffy, Kathleen H.

179 99, H04M 164

Patent

active

039340988

ABSTRACT:
A message waiting transfer circuit for use in a telephone system is described. An attendant telephone set is arranged to monitor the calls received by a plurality of principal telephone sets. The attendant set includes a receiver (and transmitter) and a separate line or principal set selection key associated with each principal set in the system. Actuation of a selected line selection key and the removal of the receiver from its cradle or switch hooks at the attendant set seizes the telephone line conductors (pair) associated with the selected principal set to enable the operator at the attendant set to answer an incoming call, etc.. The attendant set includes a message control key for providing a message waiting signal to any selected principal set. A separate message waiting transfer circuit is connected between each principal set and the attendant set. Each message waiting transfer circuit includes a first relay responsive to the seizure of the line conductors of the associated principal set by the attendant set and a second relay responsive to the operation of the first relay and to the message control key for transferring a message waiting signal to the associated principal set.
The message waiting transfer circuit may be employed separately or in conjunction with a ring transfer circuit which automatically transfers ringing signals from the associated principal set to the attendant set after a predetermined time delay to enable the attendant set operator to answer calls for absentee principal set users.

REFERENCES:
patent: 2884491 (1959-04-01), Breen
patent: 3050592 (1962-08-01), Burgener
patent: 3322903 (1967-05-01), Chapin
patent: 3532832 (1970-10-01), Hestad et al.

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