... Interface, Second Stage Dialing and Ring-back Tone, DTMF Auto Dial, Tone Detection, RTP voice Proxy (for NAT traversal ... Calling ControlCalled/Calling Party Number TranslationSecond Stage DialingVoice DetectionAuto Dialing with DTMFRingback Tone· Voice Proxy RTP Voice Proxy Function (for ... Interface ConnectorRJ-45, 10/100 Base-T, 10/100 Auto Sensing·E1/T1 interfaceRJ-45· System Memory128 MB· Flash ...