Settings > Sound > Function Key for the Ringtone

Function Key for the Ringtone
Press the key to switch the ringtone on or off or to change it.
Press the key during an incoming call to switch the ringtone on or off for this call or toggle.
In addition, when functions are assigned on the first key level, the status of the function is indicated by the corresponding LED.
 
 
Proceed as follows by assigning the function key:
Note: For further information about the general procedures when assigning function keys, see Function Keys.

COMfortel 1400 IP/2600 IP/3600 IP - Firmware V2.8 - Advanced Information V03 12/2020