... , G.729A, G.723,iLBC,GSM), echo cancellation (G.168), DTMF relay (RFC2833), and fax relay (T.30, T.38) etc ... , RADIUS Billing Interface, Second Stage Dialing and Ring-back Tone, DTMF Auto Dial, Tone Detection, RTP voice Proxy (for NAT traversal ... ISDN connections to ISDN PBXs and supports features such as Caller ID and Direct Inward Dialing.The WSS100-TG supports wide array ...