Bluetooth HFP Introduction

HFP is the abbreviation of hands-free profile.

1. Introduction 1.1 Purpose

HFP allows Bluetooth devices to control calls, such as answering, hanging up, rejecting, And dialing voice.

1.2 Use Cases

Common scenarios are car kits and Bluetooth headsets. connect them to your phone and use them to make and receive calls.

1.3 dependency

As shown in, HFP depends on serial port profile and Generic Access Profile.

1.4 protocol stack

Hands-free control is the entity responsible for hands-free unit specific control signals
The signal is based on the AT command

1.5 roles

HFP defines two roles: the audio Gateway (AG) and the hands-free component (HF:

Audio Gateway(AG)-This device is the input/output gateway of audio (especially mobile phones ).
Hands-free components (HF)-This device acts as the remote audio input/output Mechanism of the audio gateway and provides several remote control functions.

2. Application Layer

Describes the features that must be supported in HFP (M indicates mandatory support, O indicates optional Support)

The detailed process of these features is as follows:

3. Blank chapter

So it is here.

4. interoperability requirements 4.1

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4.2 service level connection Establishment

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