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I posted this on raspberrypi.stackexchange.com with no luck, figured it is more of a generic linux question than Raspberry pi specific.

I have been using this tool to quickly configure my Pi2 as a bluetooth audio link to my camper van, it works brilliantly.

My question is regarding changing the class of the bluetooth device so it can receive phone call audio too like a normal car hands free kit.

I will admit I am not 100% familiar with all the terminology involved so will apologise in advance.

If I change the class value in /etc/bluetooth/main.conf and reboot I get a different class listed in the bluetoothctl tool output. To get the class I used this tool https://www.ampedrftech.com/cod.htm

When I make the change I think the system is correcting the Class to be Rendering (Speaker) and Capturing (Microphone) Device but I do not see the phone audio option on my phone (See screenshot).

/etc/bluetooth/main.conf

[General]

# Default adapter name
# Defaults to 'BlueZ X.YZ'
#Name = BlueZ

# Default device class. Only the major and minor device class bits are
Name = Orion Audio Link
# considered. Defaults to '0x000000'.
#Class = 0x000100
Class = 0x600420

This is the output from bluetoothctl

pi@raspberrypi:/etc/bluetooth $ sudo bluetoothctl
[NEW] Controller 00:1A:7D:DA:71:13 Orion Audio Link [default]
[NEW] Device 54:B1:21:94:3C:26 deans
[bluetooth]# show
Controller 00:1A:7D:DA:71:13
 Name: Orion Audio Link
 Alias: Orion Audio Link
 Class: 0x0c0420
 Powered: yes
 Discoverable: yes
 Pairable: yes
 UUID: Headset AG (00001112-0000-1000-8000-00805f9b34fb)
 UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
 UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb)
 UUID: Generic Access Profile (00001800-0000-1000-8000-00805f9b34fb)
 UUID: PnP Information (00001200-0000-1000-8000-00805f9b34fb)
 UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
 UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb)
 UUID: Audio Source (0000110a-0000-1000-8000-00805f9b34fb)
 Modalias: usb:v1D6Bp0246d052B
 Discovering: no

Screenshot from my phone: