04998243 is referenced by 74 patents and cites 7 patents.

A device for providing teleconference capabilities in an ISDN includes a first receiver for receiving a first signal representing a first message over a first ISDN B-channel. A second receiver receives a second signal representing a second message over a second ISDN B-channel. A receive mixer mixes the first signal with the second signal to produce a receive mixed signal. A local receiver receives a local signal representing a local message to be transmitted over the first and second ISDN B-channel. A first transmit mixer mixes the first signal with the local signal to produce a first transmit mixed signal. A first transmitter transmits the first transmit mixed signal over the second ISDN B-channel. A second transmit mixer mixes the second signal with the local signal to produce a second transmit mixed signal. A second transmitter transmits the second transmit mixed signal over the first ISDN B-channel.

Title
ISDN terminal adapter with teleconference provision
Application Number
7/419234
Publication Number
4998243
Application Date
October 10, 1989
Publication Date
March 5, 1991
Inventor
Ming Luh Kao
Miami
FL, US
Agent
Jerry A Miller
Assignee
Racal Data Communications
FL, US
IPC
H04M 3/42
H04J 3/12
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