... + 1 IAX2 Line Asterisk, 3CX Compatible VoIP Phone 2 RJ 45 Ports Support VLAN,VPN ... SIP server. Support SIP application, including SIP Call forward/transfer/holding/conferenceNetwork Features: Support PPPoE ... Support SNTP Client to get time from internet Support advanced DSP tech to ensure ... avoid-disturb setting, auto-answering, Call waiting, call transfer, three ways call, and multi-dial forward Setting ...