... .723,iLBC,GSM), echo cancellation (G.168), DTMF relay (RFC2833), and fax relay (T.30, T.38) etc.Rich FeaturesWSS100-TG ... Detection, RTP voice Proxy (for NAT traversal), T.38 Fax Relay. WSS100-TG supports ISDN PRI and SIP protocols and it ... (for NAT/Firewall Traversal)· Fax ProcessingT.30, T.38 Fax Relay· BillingRadius Interface· Gateway ConfigurationWeb Based User Interface, Text Based Configuration ...