cat /etc/bluetooth/audio.conf
# Configuration file for the audio service
    # This section contains options which are not specific to any
    # particular interface
    [General]
    Enable=Gateway,Source

    # Switch to master role for incoming connections (defaults to true)
    Master=true

    # If we want to disable support for specific services
    # Defaults to supporting all implemented services
    #Disable=Gateway,Source,Socket
    Disable=Socket

    # SCO routing. Either PCM or HCI (in which case audio is routed to/from ALSA)
    # Defaults to HCI
    #SCORouting=HCI

    # Automatically connect both A2DP and HFP/HSP profiles for incoming
    # connections. Some headsets that support both profiles will only connect the
    # other one automatically so the default setting of true is usually a good
    # idea.
    AutoConnect=true

    # Headset interface specific options (i.e. options which affect how the audio
    # service interacts with remote headset devices)
    [Headset]

    # Set to true to support HFP, false means only HSP is supported
    # Defaults to true
    HFP=true

    # Maximum number of connected HSP/HFP devices per adapter. Defaults to 1
    MaxConnected=2

    # Set to true to enable use of fast connectable mode (faster page scanning)
    # for HFP when incoming call starts. Default settings are restored after
    # call is answered or rejected. Page scan interval is much shorter and page
    # scan type changed to interlaced. Such allows faster connection initiated
    # by a headset.
    FastConnectable=true

    # Just an example of potential config options for the other interfaces
    #[A2DP]
    #SBCSources=1
    #MPEG12Sources=0