FOR CONNECTING AN ABB-WELCOME SYSTEM WITH THE ANALOG INPUTS OF A PRIVATE BRANCH EXCHANGE (PBX). PERMITS THE USE OF A TELEPHONE (E.G., DECT, ISDN, MOBILE TELEPHONE) AS INDOOR DOOR COMMUNICATION STATION. TAKING DOOR CALLS, OPENING THE DOOR AND SWITCHING THE LIGHT VIA THE TELEPHONE KEYPAD (DTMF). SWITCHING BETWEEN THE FREELY-PROGRAMMABLE TARGET NUMBERS VIA THE TELEPHONE KEYPAD (DTMF). PIN PROTECTION FOR ALL CONFIGURATION SETTINGS. FOR ABB-WELCOME SYSTEMS WITH UP TO 99 APPARTMENTS. PROGRAMMING VIA THE TELEPHONE KEYPAD (DTMF) OR VIA WEB BROWSER (REQUIRES IP GATEWAY 83342-5..). 2 SCREW-TYPE TERMINALS FOR THE ANALOG A'/B' CONNECTION TOWARDS THE PRIVATE BRANCH EXCHANGE (PBX).