... FXO/FXS; 2)1 or 2 E1; 3)With SIP protocol; 4)Signaling support: SS7, ISDN PRI, R2 ... base on customer requirement.* 1 or 2 E1/T1 Port* E1 Signaling Support: SS7, ISDN-PRI, Q.SIG ... , V5.2 and T1 Signaling Support:ISDN-PRI,SS7* 2 DSP, can handle 128 ... Intelligent router distribute and telephone traffic sharing * CDR output support TCP or UDP * Grouping switching management, have PBX function like: ...