... devices are designed to enable the offering of next generation voice services to residential and small ... SIP, MGCP and H.323, achieving out-of-the-box interoperability with the industry leading softswitches, ... PSTN alive when power offSupports fast emergency callSupports Quality of Service (Qos) for voiceCaller ID, Call Hold, ... ISSUE 2, ITU G.992.1 (G.DMT),ITU G.992.2 (G.LITE),G.992.3 (G.DMT.BIS, also ...