... support:SS7, PRI, Q.SIG, R2, V5.2 Description:NC-AD300X Programmable PABX is designed and manufactured ... control interface, supporting SS7, ISDN PRI, V5.2 signaling, can be programmed for all center and ... Signaling support: SS7, DSSI, Q.SIG, R2, V5.2;·Protocol support: SIP, H.323, RTP/RTCP;·Codecs: ... E1, internal;·Echo cancellation:G.168, 128ms Network echo cancellation;Main feature· Support SS7,ISDN PRI, ...