Key Features Allowed and Denied Numbers Automatic Number Translation Auto-Attendant Busy Lamp Field (BLF) Call Forking Call Progress Tones Caller-ID Based Routing Direct-Dialing-In (DDI Routing) Dial Plan Do-Not-Disturb (DND) Daylight Saving Time Adjustment Dynamic DNS (DDNS) FAX Homing Instant Messaging (IM) NAT and STUN Support Peer-to-Peer Calling RADIUS Client SMTP Client Time Table User Groups VoIP Silence Disconnect Timer