ISDN terminal adapter with teleconference provision

A device for providing teleconference capabilities in an ISDN, comprising in combination:

• first receiving means for receiving a fist voice signal representing a first voice message transmitted by a first voice terminal over a first ISDN logical B-channel;
• second receiving means for receiving a second voice signal representing a second voice message transmitted by a first voice terminal over a second ISDN logical B-channel;
• receive mixing means coupled to said first and second receiving means for mixing said first voice signal with said second voice signal to produce a receive mixed signal;
• local receiving means for receiving a local voice signal representing a local voice message to be transmitted over said first and second ISDN logical B-channel to said first and second voice terminal;
• first transmit mixing means for mixing said first voice signal with said local voice signal to produce a first transmit mixed signal;
• first transmitting means for transmitting said first transmit mixed signal to said second voice terminal over said second ISDN logical B-channel;
• second transmit mixing means for mixing said second voice signal with said local voice signal to produce a second transmit mixed signal;
• and
• second transmitting means for transmitting said second transmit mixed signal to said first voice terminal over said first ISDN logical B-channel.

A method of implementing a conference call in an ISDN, comprising the steps of:

• providing a first terminal adapter with access to first and second communication channels, said first terminal adapter being coupled to a first source of information which produces said first information;
• creating a logical connection to a second terminal adapter over said first communication channel, said second terminal adapter being coupled to a second source of information which produced second information;
• creating a logical connection to a third terminal adapter over said second communication channel, said third terminal adapter being coupled to a third source of information which produces third information;
• mixing said second information received over said first communication channel with said first information;
• transmitting said mixed second and first information over said second communication channel to said third terminal adapter;
• mixing said third information received over said second communication channel with said first information;
• transmitting said mixed third and first information over said first communication channel to said second terminal adapter;
• and
• mixing said second and third information received over said first and second communication channels respectively together and providing said mixed second and third information to said first source of information.