Music on Hold with Announcement
Proceed as follows:
• Using the Configuration Manager (page Functions > Music on Hold and Announcements > File assignment)
Volume of music on hold during the announcement 
Specifies how loudly the music on hold should be played during the announcement.
Mix announcement into music on hold
An announcement is played together with music on hold.
Note: When switched off, music on hold is played without an additional announcement.Announcement delay time (0..60 sec.)
Specifies how many seconds delay there will be between the individual repetitions of the announcement.