This article explains what this error means, why it happens, and step-by-step solutions to get your headset working properly. The "Handsfree Telephony parameter is incorrect" error typically appears in Device Manager under your Bluetooth headset’s properties. It indicates that Windows is unable to properly configure the Handsfree Telephony service —the protocol that allows two-way audio (mic + speaker) over Bluetooth.
If you’ve ever connected a pair of Bluetooth headphones or a headset to your Windows PC, only to find that you can hear system sounds but your voice won’t go through—or the audio quality suddenly becomes terrible during calls—you may have encountered a frustrating error message: "Handsfree Telephony parameter is incorrect." handsfree telephony parameter is incorrect
Still stuck? Try connecting the headset to another PC to rule out a headset issue, or contact your PC manufacturer’s support for a custom driver package. This article explains what this error means, why