PBX Telephone System NC-AD300E with SS7, PRI, R2, Q .SIG, V5.2

1)24 or 12 VoIP channel; 2)1 or 2 E1; 3)SIP protocol; 4)Signaling support: SS7, ISDN PRI, R2, Q.SIG, V5.2; 5)4~32 FXO/FXS;
PBX Telephone System NC-AD300E with SS7, PRI, R2, Q .SIG, V5.2