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TEL Line Connector - Analog station line connection (Tip and Ring) is made via an RJ11 connector that is
Auto Answer Feature - The Auto Answer feature can be enabled or disabled depending on where the jumper is set.
Timer - The Timer feature is jumper selectable and can be enabled or disabled.
Speaker Volume - The Speaker Volume POT can be adjusted to increase or decrease the speaker volume to the desired level.
Mic Level - A Mic Level 
POT is provided on the LUADS for increasing or
decreasing the microphone return talk level.
Timer Duration - The LUADS is equipped with an adjustable call timer dura- tion feature that automatically hangs up the unit after the preset time has elapsed.