Clicking the setting button will display the Music on Hold icon will take you to the Music on Hold center.
Clicking the Settings button will give you the option to play an introductory greeting.
To enable this, check the Play introductory greeting box to enable it. When the option is selected, you will be asked to upload a WAV or mp3 file of the introductory greeting. This introductory greeting will always play first when someone is placed on hold then music afterwards.