Nortel Programming Overlay M-Series Phones
Phone System Programming Overlay
Note: When entering System Programming (**266344), refer to the Programming Overlay. This enables you to know which buttons to press for "Heading", "Show", "Back" and "Next" buttons, which are not printed on the phone itself.
M-Series
![Programming overlay for M-Series Nortel Networks phones](https://cdn.shopify.com/s/files/1/0776/5659/files/M-series_programming_template.png?v=1585792173)