NEC SL2100 - 4.5.2 Holding a Call Exclusively; 4.5.3 Retrieve a Held Outside Call

SL2100 GETTING STARTED GUIDE
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The procedure for mounting the expansion interface boards are as followings;
!! Not all boards are hot swappable. Do not remove or install from the chassis when powering
up.
1) Ensure the Chassis are powered off and unplug the AC cord.
2) Use micro nipper to cut and remove the plastic knockouts as required for each expansion
interface board slot.
!!
For your safety, smooth the cut edges after removing the plastic knockout.
3) Insert an expansion interface board in the guide rail of the chassis and push it securely into
position and tighten the two screws of the board.