... E1 or T1 Interface by WEB support US/Euro ISDN PRI signaling & SIP protocol T.38 fax realy,Routing table VoIP SIP E1/T1 ISDN PRI ... Trunk gateway Support PRI and SIPT.38 Fax RelayRouting table120 concurrent ... WEB Mode, Remote Software Upgrade, Alarm, Performance DataSignaling· PSTN Side ISDN PRI Standard: ANSI, NI-2, DMS, 5ESS· VoIP ProtocolSIP (RFC3261) ...