I'm not super familiar with the pipewire internals, but I believe pipewire is the daemon responsible for talking to bluez/bluetoothd and ensuring that the audio

I'm not super familiar with the pipewire internals, but I believe pipewire is the daemon responsible for talking to bluez/bluetoothd and ensuring that the audio stream is encoded with a codec that the headset supports. For example, this is the PR that enabled mSBC support for the HFP profile: https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/469 https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_req...