NC-AD300E Manual- 28 -slots can be blocked.After completion of editing, write to ROM, restart the device for effective.5.2.4.3 SS7 SignalingFor use of signaling SS7, you must first add the link parameter. In Index area select SS7signaling, right click mouse button to add a new SS7 link in Parameter area.This Can also be done in the "Data" menu, select "Add", or click on the toolbar Button toadd a link. Once installed, then modify the parameters one by one.Link ID, Internal index number for SS7.