2.4 Auto-Attendant Function

Class 5 and 6 mailboxes allow the caller to switch to another destination using speed-dialing. The caller can select another user (including external users) or another mailbox during the announcement by pressing the appropriate number key at his telephone. The caller must be informed of the available options via the announcement. A break should be provided at the end of greeting, allowing the caller to enter a number 

If the speed-dial destination is also a mailbox, its greeting message is played back. Several mailboxes can be linked in this way, and complex applications can be created (e.g. automatic information services). Auto-attendant mailboxes are distinguished by a greeting duration of 8 minutes (company greeting).