Tema AA-10 Universal Doorphone PBX (FXS) Interface Connection to an Analog Trunk Interface, fits with all for existing Door Entry System

Door Phone analog Pbx Interface
(Power supply not included, order separately Tema T7012 12V Power supply)

Differences:
AA-11RT     is made to interface traditional doorphone (4-5 wires) to an analog PBX FXO line (where are normally connected standard analog telephones)
AA-11/PA    is made to interface an analog power amplifier to an anaolg PBX same FXO line: from every telephone of the plant is possible to launch an announcement to the amplifier calling the telephone number of AA-11/PA

Same functions are available for trunk analog line of the PBX FXS models AA-10 and AA-10/PA.