Support 2.0 and correlative RFCs Support 2 SIP lines Codec:G.711 A/U Law,G.729A/B,G.726 3 way conference (Best gear to connect Polycom Soundstation) Support T.38 FAX up to 100 pages Support L2TP/PPTP VPN High performance of router mode 1 FXS, 1 PSTN(LIFELINE) 2xLAN