ALE M3-M5-M7-M8 DeskPhones Administrator Guide   
If you change this parameter, the IP phone will reboot for the change to take effect. 
 
Note: This configuration is not available for the M8 Phone. 
12.1.3 AudioHub Programmable Key Configuration Parameters 
The following table lists the parameters you can use to configure the AudioHub programmable key. 
It configures the USB-A mode. It can be set to Host which can plugin audio accessories 
such as USB headset and USB external handsfree or set to Audio Hub which can be 
regarded as PC's sound equipment. 
Note: This configuration is not available for the M8 Phone. 
Menu → Basic Setting → USB 
It configures the USB-C mode. It can be set to Host which can plugin audio accessories 
such as USB headset and USB external handsfree or set to Audio Hub which can be 
regarded as PC's sound equipment. 
Menu → Basic Setting → USB 
It configures the programmable key type. X can be number 1~20 for M3 or 1~28 for 
M5/M7 and 1~36 for M8. 
Select one program key, then long press it for 2s, and select Key Type as Audio Hub.