Best Box - Siemens solution - Alphatech (en)

The solution for connecting to exchange babysitting with the current line - such as Siemens
BestBox monitors line voltage and prevents disconnection of lines on the PBX to connect the analog communicator as the elevator door. This is true but only for panels that power line patrol, particularly some types of Siemens PBXs. When connected to a standard analog line is the equipment needed, because there current monitoring system is either not, or can be turned off.