AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 90

Hardware Components
Model MLX-20L
The MLX-20L telephone provides the following features:
Can be used for system programming and as a DLC or a QCC system
operator console
20 line buttons
Display (7 lines x 24 characters)
14 display-associated buttons
8 dedicated feature buttons
Accommodates one or two DSSs
This telephone is not wall-mountable.
Figure 2-7. MLX-20L Telephone
2-16 Telephones and Consoles