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An adapter apparatus for coupling a headset and an audio device to a telephone headset amplifier includes a first interface for sending and receiving audio signals with the telephone headset amplifier, a second interface for sending and receiving audio signals with the headset, a third interface for

An adapter apparatus for coupling a headset and an audio device to a telephone headset amplifier includes a first interface for sending and receiving audio signals with the telephone headset amplifier, a second interface for sending and receiving audio signals with the headset, a third interface for sending receiving audio signals with the audio device, and a switching circuit coupled to the three interfaces, wherein the switching circuit provides a communications link between at least two of the first interface, the second interface, and the third interface as a function of a selected mode. In a first mode, a communications link between the second interface and the third interface is established where the audio device either provides audio signals to or receives audio signals from the headset. In a second mode, a communications link between the first interface, the second interface, and the third interface is established where the audio device receives audio signals from the headset and from the telephone headset amplifier over the communications link. In a third mode, a communications link between the first interface, the second interface, and the third interface is established where the audio device provides audio signals to the headset and to the telephone headset amplifier over the communications link.

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What is claimed is: 1. An adapter apparatus for coupling a headset and an audio device to a telephone headset amplifier, the apparatus comprising: a. a first interface for sending audio signals to and receiving audio signals from the telephone headset amplifier; b. a second interface for sending au

What is claimed is: 1. An adapter apparatus for coupling a headset and an audio device to a telephone headset amplifier, the apparatus comprising: a. a first interface for sending audio signals to and receiving audio signals from the telephone headset amplifier; b. a second interface for sending audio signals to and receiving audio signals from the headset; c. a third interface for sending audio signals to and receiving audio signals from the audio device; and d. a switching circuit coupled to the first interface, the second interface, and the third interface, wherein the switching circuit provides a communications link between at least two of the first interface, the second interface, and the third interface as a function of a selected mode, wherein a first communications link is provided between the second interface and the third interface when a first mode is selected, and a third communications link is provided between the first interface, the second interface, and the third interface when a third mode is selected such that the audio device provides audio signals to the headset and to the telephone headset amplifier over the third communications link. 2. The adapter apparatus according to claim 1 wherein when the first mode is selected, the audio device provides audio signals over the first communications link to the headset. 3. The adapter apparatus according to claim 2 wherein the audio device is one of a selective CD player, cassette tape player, MP3 player, sound card, CD-port from a computer, and another headset with a microphone. 4. The adapter apparatus according to claim 1 wherein when the first mode is selected, the audio device receives audio signals over the first communications link from the headset. 5. The adapter apparatus according to claim 4 wherein the audio device is one of a selective speech recognition device and audio recording device. 6. The adapter apparatus according to claim 1 wherein the switching circuit provides a second communications link between the first interface, the second interface, and the third interface when a second mode is selected, wherein the audio device receives audio signals from the headset and from the telephone headset amplifier over the second communications link. 7. The adapter apparatus according to claim 6 wherein when the second mode is selected, the audio device is one of a selective speech recognition device and audio recording device. 8. The adapter apparatus according to claim 6 wherein the second mode enables a conventional telephone call to be established between a user of the headset and a called party via the telephone headset amplifier. 9. The adapter apparatus according to claim 1 wherein when the third mode is selected, the audio device is one of a selective CD player, cassette tape player, MP3 player, sound card, CD-port from a computer, and another headset with a microphone. 10. The adapter apparatus according to claim 1 further comprising a mode selection switch for selecting the mode. 11. An adapter apparatus for coupling a headset and an audio device to a telephone headset amplifier, the apparatus comprising: a. a first means for sending audio signals to and receiving audio signals from the telephone headset amplifier; b. a second means for sending audio signals to and receiving audio signals from the headset; c. a third means for sending audio signals to and receiving audio signals from the audio device; and d. a switching means for coupling the first means, the second means, and the third means, wherein the switching means provides a communications link between at least two of the first means, the second means, and the third means as a function of selected mode, wherein a first communications link is provided between the second means and the third means when a first mode is selected, and a third communications link is provided between the first means, the second means, and the third means when a third mode is selected such that the audio device provides audio signals to the headset and to the telephone headset amplifier over the third communications link. 12. The adapter apparatus according to claim 11 wherein when the first mode is selected, the audio device provides audio signals over the first communications link to the headset. 13. The adapter apparatus according to claim 12 wherein the audio device is one of a selective CD player, cassette tape player, MP3 player, sound card, CD-port from a computer, and another headset with a microphone. 14. The adapter apparatus according to claim 11 wherein when the first mode is selected, the audio device receives audio signals over the first communications link from the headset. 15. The adapter apparatus according to claim 14 wherein the audio device is one of a selective speech recognition device and audio recording device. 16. The adapter apparatus according to claim 11 wherein the switching means provides a second communications link between the first means, the second means, and the third means when a second mode is selected, wherein the audio device receives audio signals from the headset and from the telephone headset amplifier over the second communications link. 17. The adapter apparatus according to claim 11 wherein when the second mode is selected, the audio device is one of a selective speech recognition device and audio recording device. 18. The adapter apparatus according to claim 11 wherein the second mode enables a conventional telephone call to be established between a user of the headset and a called party via the telephone headset amplifier. 19. The adapter apparatus according to claim 11 wherein when the third mode is selected, the audio device is one of a selective CD player, cassette tape player, MP3 player, sound card, CD-port from a computer, and another headset with a microphone. 20. The adapter apparatus according to claim 11 further comprising a mode selection switch for selecting the mode.