AT&T Callmaster Series Reference Manual page 239

Feature Buttons
The 7406D, 7406 BIS, and 7406 Plus voice terminals have the following buttons and features:
Four Standard Fixed Feature Buttons
The 7406D, 7406BIS, and 7406 Plus have the following four standard fixed feature buttons:
CONFERENCE or CONFERENCE/RING button
DROP or DROP/TEST button
TRANSFER button
HOLD button
Message light
The 7406D, 7406BIS, and the 7406 Plus have a Message light. The Message light goes on
when a message is left for the user. It goes off when the user has retrieved the message.
SHIFT button (on 7406D and 7406BIS)
The 7406D and 7406BIS (7406D01A—7406D06A) voice terminals have a SHIFT button which
allows programming and use of a second feature or phone number for the seven double-level
buttons. When the user presses the SHIFT button (and the light next to the button is on), the
top-level feature on the shiftable (2-level) button can be used. (When the SHIFT button light is
off, the feature assigned to the lower half of the shiftable button can be used.)
SELECT RING button (on 7406D and 7406BIS)
The 7406D and 7406BIS (7406D01A—7406D06A) voice terminals have a SELECT RING button
which is used for selecting a personalized ringing pattern. (There are eight different patterns to
choose from.)
7406D, 7406BIS, and 7406 Plus Voice Terminals
3-149