The Most Cost-effective ATA Products Information Best-quality Terminal Adapter that matches up to that of Grand streams. 1 WAN, 1 LAN(100M Router/Bridge), 1 F*S and 1 PSTN ports. Fully support Asterisk IP PB*. Provide Auto provisioning, Auto new version check and Auto update. SIP protocol For consumer or family use 1 F*S port, 1 Line (Can use for PSTN in and out to PSTN) port Ethernet ports: TWO* 10/100 Base-T Ethernet ports, Bridge/Router function Functions: Out route selection(use VoIP or PSTN), Caller ID transfer(VoIP and PSTN),Volume adjust Support features: Call hold/Retrieve, Call waiting, Call transfer, 3-way calling, G.711 fa*, MWI, Do Not Disturb, Call forwarding: Busy, No answer, Unconditional Impedance: optional Automatically new version detection and user can upgrade by key in the special number Auto configure download Dimension:108* 72* 26 (L * W * H) If you are interested,please send mail to sales01(0) and change (0) to @ Thank you.