AT&T Merlin Legend MLX-20L Operation Manual page 116

Automatic Release
A feature you use to automatically disconnect an active call when
you press a new call button. You will either have Automatic Hold or
Automatic Release. 2-11
B
Barge-In
A feature you use to reach a co-worker who is on the phone or using
Do Not Disturb. 4-10
Button-labeling card
A card that is labeled with the feature assigned to each call and fixed
feature button. 1-5
C
call buttons
The five buttons on the queued call console (QCC) you use to make
and receive outside and inside calls. 1-5, 1-9, 1-10
Camp-On
A feature you use to have a directed call wait at a busy or
unanswered extension for a longer period of time than Release
would allow. 4-11