... PABX 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 PABX ... -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 ... Remote Extensions Mobile Extensions Fax Detection Automatic Route Selection IP PABX Phone System