1.support SIP V2 2.Two 10/100 Ethernet for WAN / ... in high performance ARM 9 Processor Basic FeaturesSupport 3 PTT port LEDs for Power, Ready, Status, WAN, PC, FXS Call Forward ... Codec: G.711 (A/µ law), G.729A/B, G.723.1 DTMF: RFC 2833, In-band DTMF, SIP INFO Physical and ...