Mlx Telephone Headsets; Analog Multiline Telephone Headset - AT&T MERLIN LEGEND System Reference Manual

Hardware
5-40 Adjuncts
Figure 5-24

MLX Telephone Headsets

Headset models used with analog multiline telephones can plug directly into the
handset jack on the analog multiline telephone or can plug into a headset
adapter connected to the OTHER jack on the bottom of the analog multiline
telephone. Various models of headsets can be used with a headset adapter:
models 502A, 502B, or 502C. If adapter 502B or 502C in the enhance mode is
used, an Auto Answer-All button must be programmed on the telephone.
These models plug directly into the analog multiline telephone handset jack:
StarSet II - StarMate E(PEC3122-204)
Supra - StarMate E
Figure 5-25

Analog Multiline Telephone Headset