Bluetooth Profiles for Headsets: HFP, A2DP, and HSP Explained

What is a Bluetooth profile?

A Bluetooth profile is a set of rules that defines how two devices use a Bluetooth connection. The radio sends the data, and the profile decides what that data means: whether it is a phone call, a music stream, or a button press. For a feature to work, both the headset and the phone or computer have to support the same profile.

Bluetooth has two radio types. The Bluetooth Classic radio streams data over 79 channels in the 2.4GHz band and has become the standard radio protocol behind wireless speakers, headphones, and in-car entertainment. The Bluetooth LE radio uses 40 channels and was designed for very low power operation. Bluetooth versions for headsets explains the version details separately.

When you see a headset listed as Bluetooth-compatible, the profiles it supports often matter more than the version number alone. Wireless headsets covers models that support all the common profiles.

Bluetooth profile cheat sheet

The four profiles you will see on headset spec sheets are HSP, HFP, A2DP, and AVRCP. The table below summarizes what each one does.

HFP: the profile for calls

HFP, or Hands-Free Profile, is the Bluetooth profile that carries two-way call audio. It connects a headset to a phone, computer, or conference device and handles the voice path in both directions plus call controls such as answer, end, redial, and mute.

HFP is the profile to look for if you spend most of the day in meetings. A headset with good HFP behavior keeps your voice clear and lets you control calls without touching the phone. Calls in Teams, Zoom, and other softphone apps go through HFP when you connect over Bluetooth. Bluetooth office headsets and office and calls headsets focus on that use.

Wideband speech support makes HFP voices sound clearer by carrying a wider range of speech frequencies. Wideband audio for headsets explains the difference in more depth.

HSP: the older headset profile

HSP, or Headset Profile, is the older and simpler calling profile. It was created for basic headsets: a single earpiece with answer and end controls. HSP still appears on spec sheets for compatibility, but modern headsets usually use HFP because it offers more controls and better voice quality.

You do not need to search for HSP. If a headset supports HFP, it generally also supports HSP for older devices. For light phone work and a low-profile earpiece, single-ear headsets are the practical place to look.

A2DP: high-quality music streaming

A2DP, or Advanced Audio Distribution Profile, is the profile for music, podcasts, and other stereo media. It streams high-quality audio from the phone or computer to the headset instead of using the narrow voice path reserved for calls.

A2DP decides that audio can flow; the codec decides how good it sounds. Codecs sit on top of A2DP and compress the audio differently. Bluetooth codecs for headsets covers the options you will see on phones and computers.

For everyday listening, you want a headset that supports A2DP on both your phone and your computer. Most stereo headsets do. The stereo headsets guide lists what to check.

AVRCP: remote controls for audio

AVRCP, or Audio/Video Remote Control Profile, is the profile that makes headset buttons useful for media. It sends commands from the headset to the phone or computer: play, pause, next track, previous track, and sometimes volume. Without AVRCP, the headset can receive audio but cannot control it.

This profile matters if you adjust music without reaching for your phone. The physical buttons themselves are covered in headset call controls, which separates call functions from media functions.

For gaming headsets, AVRCP works alongside A2DP so you can manage music without leaving the game.

How the profiles work together

A headset does not pick one profile for everything. It juggles them depending on what is happening. While you listen to music, the headset uses A2DP to receive the stream and AVRCP to receive your playback commands. When a call comes in, it switches to HFP, and the music path pauses or fades.

This switching is why music can sound hollow or flat during a call. The headset is using the narrower HFP voice path, not the A2DP music path. It is normal behavior, not a defect.

Bluetooth multipoint adds another layer by keeping two devices connected at the same time. Bluetooth multipoint for headsets explains how profiles behave when a call arrives on the second device.

What to pick for your use

For calls, prioritize HFP. Look for a headset with a clear microphone, wideband speech support, and call controls on the earcup. The Teams headsets guide is built around that requirement.

For music and media, prioritize A2DP and AVRCP. A stereo headset with a modern codec and accessible controls covers most listening.

Keep volume reasonable. The NIDCD reports that music through headphones at maximum volume can reach 94 to 110 dBA, and long or repeated exposure to sounds at or above 85 dBA can cause hearing loss. The CDC defines hazardous noise as 85 dBA or higher and notes that prevention and early detection are important. The WHO estimates over 1 billion young adults are at risk of permanent, avoidable hearing loss from unsafe listening practices.

What to pick for your use

Questions

What is a Bluetooth profile?

A Bluetooth profile is a set of rules that defines how two devices exchange data over Bluetooth. The radio carries the signal, and the profile tells the devices what to do with it: call audio, music streaming, or remote controls.

Is HFP or A2DP better?

They serve different jobs. HFP is for two-way call audio and call controls. A2DP is for high-quality stereo music and media. A good headset supports both, so you get clear calls and good music from one device.

Can a headset use HFP and A2DP at the same time?

Not for the same audio path. When a call is active, the headset switches from A2DP music streaming to HFP call audio. When the call ends, it switches back. This is why your music stops or changes quality during a call.

Do all headsets support AVRCP?

Most modern Bluetooth headsets do, but support varies. If media controls on the headset are important, check the product specification for AVRCP before buying.

Why does music sound worse on a call?

Because calls use the HFP voice path, which is designed for speech rather than music. The headset leaves the A2DP music path during the call, so you hear a narrower, thinner sound until the call ends.

Does Teams or Zoom need a special Bluetooth profile?

No. Teams, Zoom, and similar apps treat the headset as a standard audio device. HFP carries the call audio over Bluetooth. Certified models add extra assurance for microphones and call handling: see Teams and Zoom certified headsets.

What is the difference between HSP and HFP?

HSP is the older Headset Profile with basic answer and end controls. HFP is the newer Hands-Free Profile with more call controls and better voice quality. Modern headsets favor HFP.