headset profile (Bluetooth) (HSP)
The Headset Profile(HSP) or Hands Free Profile( HFR) is a Bluetooth profile with which headsets can communicate with Bluetooth devices.
The communication concerns the voice input as well as the voice output in the same way.
The HSP profile is based on the Serial Port Profile( SPP) and uses it for the exchange of AT commands to control the headset. The bandwidth for mono transmission is 3.1 kHz, the sampling rate is 8 kHz. Connection establishment and disconnection are performed via the intermediate audio gateway.