AT&T Classic Mail Voice Messaging System - Manual (Page 59)

7. If you know the destination party is
not available, or if you want to place
the calling party directly into the mailbox
without ringing the intercom
press
#
8. Hang up.
Note: There may be situations where you are notable to transfer
callers into the CLASSIC MAIL system because you lack the necessary
line appearances on your telephone. In these situations, we recommend
that you transfer the caller back to the attendant, who can then transfer
the caller into the CLASSIC MAIL system.
Merlin 1030/3070 Transfer Procedures for Attendants
If you have a Merlin 1030/3070 system and you are the
attendant, use the procedure that follows. Note that your
telephone should have line appearance buttons similar to
those shown in Figure 5B to use this procedure.
To transfer a caller to the CLASSIC MAIL system:
1. Ask the caller to hold.
CLASSIC MAIL System Mailbox User Guide