Introduction 1-13Rear PanelFigure 1-4 AccessBuilder 500 Rear Panel FeaturesVOICE This port is used to connect an optional public switched telephonenetwork (PSTN) telephone handset, or any other compatible analogequipment, operating in digital tone multiple frequency (DTMF) mode,by connecting the handset’s plug into this port.This port is in effect an analog to digital convertor which allows you touse your conventional PSTN telephone on an ISDN line. It is capable ofsupporting ringing current and call progress tones, and supportsanalog devices to a maximum ringer equivalence number (REN) of one(United Kingdom). Providing one of the two ISDN B channels is notbeing used by the unit, then a voice call can be made.Incoming ISDN traffic carries both a voice and data identifier anddepending on the type of transmission, a voice call is automaticallydirected to the appropriate port connected to the telephone handset.The Voice port has a British Telecom phone socket. Use the BT to RJ11converter supplied with the unit to connect voice equipment outside the UK.
