Northern Telecom 3X8 Owner's Handbook Manual page 135

Feature programming
Hold or release
and HOLD
Notes
When this Guide tells you to enter a feature code, you can do so
by pressing a memory button programmed with that feature code.
In some cases, pressing the button a second time cancels the
feature.
On the M7100 Telephone, Button Inquiry shows your internal
number followed by the function assigned to your single memory
button.
Any memory button not programmed'as an external or internal
line, Answer button, or Handsfree/Mute button, is available for
programming features.
The following feature codes cannot be programmed onto a
memory button: any code beginning with
Choice and Contrast Adjustment.
DR5.1 Owner's Handbook
You cannot program a feature button
while you are on a call.
Press the button you want-to program
the feature onto.
Press the button you want to check.
Press or
EXIT when you are
finished.
This display pertains only to the
M7208 Telephone. To erase a button,
press
To erase a button, press
press
You have tried to use Button Inquiry
while you were on a call or had calls
I
on hold.
q
except Language
or
PO842627