For the sounds to be played in Zabbix frontend, Frontend messaging must be enabled in the user profile Messaging tab, with all trigger severities checked, and sounds should also be enabled in the global notification pop-up window.
If for some reasons audio cannot be played on the device, the button in the global notification popup window will permanently remain in the "mute" state and the message "Cannot support notification audio for this device." will be displayed upon hovering over the button.
Default audio clips are in MP3 format.
Note that since 4.4.4 sounds are supported in MP3 format only.
The sounds of Zabbix frontend have been successfully tested in recent Firefox/Opera browsers on Linux and Chrome, Firefox, Internet Explorer, Opera and Safari browsers on Windows.
The auto play of sounds may be disabled in recent browser versions by default. In this case, you need to change this setting manually.