A centralized recorded announcement unit shared by multiple end offices on
a public switched telephone network stores announcements in digital
files. When a call is received at a switch and an announcement is
required, the announcement is played to the caller by an announcement
device if the particular announcement file is stored locally. If the
announcement is not stored locally, a request is sent to the centralized
recorded announcement unit to retrieve the announcement file and play the
announcement to the caller. Both the request and the announcement file
are sent via a packed-switched network.