Patent ID: 8438659

Claim:
A method of authenticating the interoperability of a headset, having a speaker and a microphone, and a device, the method comprising: coupling the headset and device together with a cord having a speaker line coupled with the speaker and a microphone line coupled with the microphone; in the headset, converting electrical signals from the device into power for the headset using a parasitic power circuit coupled with at least one of the speaker line or the microphone line of the cord; using a modem circuit powered in the headset and coupled with at least one of the speaker line or the microphone line, monitoring at least one input on at least one of the speaker line or the microphone line for a verification signal from the device; and in response to failing to detect the verification signal within a predetermined period of time, selectively disabling at least one of the speaker or the microphone of the headset.