... 4 E1/T1 ports VoIP SIP E1/T1 ISDN PRI Trunk gateway Support PRI and SIPT ... T.38)Ideal PSTN termination for IP phones, VoIP gateway, IPPBX, PBX accessEmbeded with RTP voice proxy ... ideal PSTN trunking gateway for IP phones, PC phones and PBX bridge to VoIP services.InteroperabilitiesThe ... 30, T.38 Fax Relay· BillingRadius Interface· Gateway ConfigurationWeb Based User Interface, Text Based Configuration· ...