... SIP v1(RFC2543),v2(RFC3261)Support IP/TCP/UDP/RTP/RTCPSupport IP/ICMP/ARP/RARP/SNTPSupport TFTP Client ... G.729A,G.729B,iLBCCall Function :Call hold,Call Waitting,Call forward,Call ID,3 way callDTMF Function:In-band DTMF,Out- ... :1×10Mbps/100Mbps RJ-45 PortFunction Keys:26 function keys besides standard keys 0-9,#,*Speaker:Full ... )Dimension:275mm×256mm×76mmWeight:1.11KG IP Phone with PSTN Port, POE function