1)24 VoIP channel or 12 VoIP channel; 2)1 or 2 E1; 3)With SIP protocol; 4)Signaling support: SS7, ISDN PRI, R2, Q.SIG, V5.2; Brief IntroductionNC-AD300E PBX is designed by Nice Communication with new concept and combination our rich experience in traditional telephony technology and VoIP for NGN,not only provide E1,FXO,FXS interface, but also provide VoIP interface to IP network.NC-AD300E PBX has ...