... to 32 FXO/FXS; 2)1 or 2 E1; 3)With SIP protocol; 4)Signaling support: SS7, ISDN PRI, R2, Q ... the telephony technology with providing E1, FXO, FXS interface.NC-AD300E PBX has its powerful signaling protocol handling and exchanging ... .703RJ45Ethernet port10/100Base-T,IEEE 802.3RJ45ConsoleRS232RJ45Analog lineseach port with 4 linesRJ45ItemSpecificationInput voltage-48V DC or 100~240V ACPower60WDimensionW ...