Apparatus for providing an ISDN to analog interface

An interface for communicating between digital ISDN signals from an ISDN terminal and an analog telephone network, comprising:

• a first circuit for receiving first ISDN signals from said ISDN terminal and separating said ISDN signals into first digital control and first digital data signals;
• a second circuit for receiving said first digital control signals and translating said first digital control signals into first translation control signals;
• a DTMF transceiver coupled to receive said first translation control signals and generating first analog telephone tone control signals;
• a third circuit for receiving said first digital data signals and said first translation control signals, and translating said first digital data signals into first analog telephone data signals under the control of said first translation control signals;
• analog coupling means for coupling said first analog telephone tone control signals and said first analog data signals to said analog telephone network, and for receiving second analog data signals and second analog telephone tone control signals from said analog telephone network;
• said DTMF transceiver receiving said second analog telephone tone control signals and generating second translation control signals;
• said second circuit receiving said second translation control signals and translating said second translation control signals into second digital control signals;
• said third circuit receiving said second analog data signals and said second translation control signals, and translating said second analog data signals into second digital data signals, under the control of said second translation control signals;
• said first circuit receiving said second digital data signals from said third circuit, and said second digital control signals from said second circuit, and combining said second digital control signals and said second digital data signals into second ISDN signals;
• digital coupling means for coupling said second ISDN signals from said first circuit to said ISDN terminal.