... signaling & SIP protocol T.38 fax realy, RFC2833, Routing table VoIP SIP E1/T1 ISDN PRI Trunk gatewaySupport PRI ... requirements. Features include: Calling/Called Party Number Translation, Routing Selection, RADIUS Billing Interface, Second Stage Dialing and Ring ... , 2976 Info Method, 3515 Refer Method, 3581 Symmetric Response Routing· RADIUS RFC 2866 Accounting· DTMFDTMF Digits Transmit: RFC2833, INFO ...