About the M3902 Nortel telephone NTMN32
The Nortel M3902 phone is designed for light telephone use in areas
such as manufacturing, warehouses, and other business environments.
This M3902 brings the display-based interface, handsfree capability
to a basic, single-line phone, three self-labeling keys, "Smart"
Mute, and a host of user-selectable options make this a powerful
single-line solution. The M3902 also increases its capabilities
by supporting a cartridge accessory that conveniently snaps into
the back of the phone. Digital phone used with Meridian Option 11,
Option 51, Option 61, & Option 81.