AT&T Classic Mail Voice Messaging System - Manual (Page 58)

Figure 5A shows the typical line numbering method
used by Merlin 206, 410, 820, and Merlin Plus
telephone systems.
If the caller wants to be transferred into the CLASSIC
MAIL system in order to retrieve messages from their
own mailbox, hang up now.
If the caller wants to leave a message for someone
else, continue with steps 6 through 8.
6. Enter the intercom or mailbox
number of the destination party.
Figure 5A: Line
numbering for Merlin
206, 410, 820 and Plus
telephones.
Chapter 5: Transferring Calls Into the CLASSIC MAIL System
53