... Auto-Attendant, 3-way-conference; Embedded SoHo IP PBX phone system with 4,8 or 16 FXO analog ports, ... and 8,16,24 FXS local extensions; and 60 IP users in local or remote, support SIP and DDNS ... VPN, it allow extensions to be boundled with cell phone, and it also directly integrates with VoIP service ... it is purchased, it supports from 8 to 24 local extensions, 60 remote extensions, and 8 to 16 ...