IP PBX Feature: 1.Open Source Asterisk IP PBX;2.High performance OSLEC;3.Configurable IVR menu;4.Custom records voice for IVR FeaturesOpen Source Asterisk IP PBXHigh performance OSLEC (Open Source Line Echo Canceller)Configurable IVR menuVoice Mail,Voicemail to EmailFollow me, Call waiting,Call transfer,Call ParkingCall conferenceDISARing groupSIP trunking, IAX trunkingPSTN analog trunkFailback ...