ENT-460 is License for 1 to 500 Extensions Supports Multiple Businesses on One Unit Group Conferencing (IVR) Interactive Voice Reponses Faxing Voicemail Call Queues Email Server Call Recordings Find Me/Follow Me Remote Telephones Music on Hold Supports Multiple Phone Numbers Supports International & Local Numbers Call forwarding Supports Analog Lines IM (Instant Messenger Chat System) Supports ( VOIP) Voice Over IP Technology