SIP IP PBX Phone system with 4 to 96 FXS/FXO ports SIP trunks for least cost calls 120 IP users Billing ... , MOH, IVR, Recording All-in-One SIP IP PBX for SOHO useressupport 4 to 96 analog ports (extensions ... group, 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 ...