... FXO; 3)Signaling support:SS7, PRI, Q.SIG, R2, V5.2 Description:NC-AD300X Programmable PABX is designed and manufactured by ... AD300X provide CTI control interface, supporting SS7, ISDN PRI, V5.2 signaling, can be programmed for all center and other value ... Network echo cancellation;Main feature· Support SS7,ISDN PRI,V5.2 Signaling· Flexible route management, inter-office management, Intelligent router ...