... realy 1 to 4 E1/T1 ports VoIP SIP E1/T1 ISDN PRI Trunk gateway Support PRI and ... .38)Ideal PSTN termination for IP phones, VoIP gateway, IPPBX, PBX accessEmbeded with RTP voice proxy ... 30, T.38 Fax Relay· BillingRadius Interface· Gateway ConfigurationWeb Based User Interface, Text Based Configuration· ... PSTN Side ISDN PRI Standard: ANSI, NI-2, DMS, 5ESS· VoIP ProtocolSIP (RFC3261) , 2976 Info Method, 3515 ...