Get An992: Hands-free And Headset

The Hands-Free Profile (HFP) specification defines a set of functions such that a Mobile Phone can be used in conjunction with a Hands-Free device (e.g., installed in the car or represented by a wearable device such as a headset), with a Bluetooth Link providing a wireless means for both remote control of the Mobile ...

Hands free typically refers to a speakerphone mode (integrating speakers and mic for two way voice communication). If your headphones have a built-in mic, this could simply be a way to select using the mic input from that source.

Hands-Free Profile (HFP) is used to allow hands-free devices such as carkits and headphones to communicate with mobile phones over a Bluetooth link. Bluetooth HFP AG Test Suite can be used for evaluating Bluetooth HFP implementations, such as phones, for security flaws and robustness problems.

The two roles are called the Audio Gateway (AG), and Headset (HS) or Hands-Free (HF). The AG is typically a phone or computer that is connected to a remote data source. It controls the HS that acts as the remote microphone and speaker and includes commands to answer, hang up, ring, and control the volume.

Hands-Free Unit (HF) is the device acting as the Audio Gateway's remote audio input and output mechanism. It also provides some remote control means. Typically a wireless headset or a car kit.

Devices that are typically used for handsfree communication use Bluetooth as its wireless technology. They still require a smartphone or other device to initiate a call. These devices include Bluetooth headsets, hands-free car kits (HFCK), and personal navigation devices (PND).

HFP Audio Gateway (HFP-AG) is the device that is the gateway of the audio, both for input and output, typically a mobile phone. Hands-Free Unit (HF) is the device acting as the Audio Gateway's remote audio input and output mechanism. It also provides some remote control means. Typically a wireless headset or a car kit.