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How to switch my phone to Headset Audio Gateway …
https://askubuntu.com/questions/1261148/how-to-switch-my-phone-to-headset-audio-gateway-hsp-hfp-in-pulseaudio
In Ubuntu 20.04 the switch between a2dp and headset_audio_gateway (HSP/HFP) happens automagically. I do use ofono as its suggested in many threads like this one: How to set up Ubuntu PC as bluetooth headset to attend calls. you could force the switch by adding to file with editor of choice (mine is vim): vim /etc/pulse/default.pa the following line:
Windows 10 "Bluetooth Audio Gateway Service" needs ...
https://answers.microsoft.com/en-us/windows/forum/all/windows-10-bluetooth-audio-gateway-service-needs/9d064cce-3d27-4b84-9ad0-63e20b9bc2a4
Windows 10 "Bluetooth Audio Gateway Service" needs frequent restarting. W10 version 20H2. Listening to audio on any BT headset and the sound just stops. I can restart the service and it works again
Bluetooth - freedesktop.org
https://freedesktop.org/wiki/Software/PulseAudio/Documentation/User/Bluetooth/
When connected to a HSP or HFP device, the bluetooth card in PulseAudio will have the "Headset Head Unit (HSP/HFP)" and/or "Headset Audio Gateway (HSP/HFP)" profiles available. When those profiles are activated, a sink and a source are created where applications can play and record audio.
Bluetooth Audio Gateway Service - Windows 10 Service ...
http://batcmd.com/windows/10/services/btagservice/
The Bluetooth Audio Gateway Service is running as NT AUTHORITY\LocalService in a shared process of svchost.exe. Other services might run in the same process. If Bluetooth Audio Gateway Service fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the BTAGService service has failed to start.
More about Supported Bluetooth Profiles - Audio Precision
https://www.ap.com/technical-library/more-about-supported-bluetooth-profiles/
HSP. HSP is the “Head Set Profile.” This profile supports only low bit rate, “voice-quality” audio, using the CVSD codec at 8 kHz sample rate or the HSP 1.6 "wideband speech" mSBC codec at 16 kHz. This profile is used for phone-to-headset communication. Roles. Supported roles are AG “Audio Gateway” (the phone) and HS “Headset”. Audio
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