Keep call back device

Details Keep call back device Keep call back device

1994-11-18

1996-12-31

Chin, Wellington

Telephonic communications

Reception of calling information at substation in wireline...

Blocking caller id transmission

379209, 379215, 379210, H04M 156, H04M 1506, H04M 342

Patent

active

055901832

ABSTRACT:
A keep call back device for connecting calls between subscribers includes a first call establishing portion for establishing a first call by connecting a call received from a calling terminal to a called terminal when it recognizes the call from the calling terminal which is able to respond to a call from one terminal without ending communication with another terminal during communication with another terminal, a second call establishing portion for establishing a second call by placing a call to the calling terminal after the first call has been established, and a call releasing portion for releasing the first call by disconnecting the same when the second call is established.

REFERENCES:
patent: 5311574 (1994-05-01), Livanos
patent: 5323444 (1994-06-01), Ertz et al.
patent: 5436967 (1995-07-01), Hanson

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