... IPPBX, PBX accessEmbeded with RTP voice proxy, Digits translationAuto Dial and RADIUS billing interface for CDRAdvanced technologies including SIP protocol ... Billing Interface, Second Stage Dialing and Ring-back Tone, DTMF Auto Dial, Tone Detection, RTP voice Proxy (for NAT traversal), T ... Interface ConnectorRJ-45, 10/100 Base-T, 10/100 Auto Sensing·E1/T1 interfaceRJ-45· System Memory128 MB· Flash ...