$SEB allow blocking of events from IP station (no analog stations) with $DP message.
Note 1: Block state will always be cleared after reset. Note 2: Only station events kicked by DIP protocoll are blocked. Events from SimpleLinkLayer ($M, $MREL e.g) are not blocked during active blocking. Note 3: $DIAL_DAK is actually (AMC 11.2.3.3) using the DIP function to simulate DAK pressing. Based on this $DIAL_DAK is blocked also at SimpleLinkLayer
1 = Block M-key from IP station
2 = Block Handset state from IP station
3 = Block Digit keys from IP station
4 = Block DAK keys from IP station
5 = Block C-key from IP station