Auto Attendant, Multi-Level IVRs, Call Queues, Ring Groups, User Status / Schedule based Routing, Skills based routing, Voicemail to Email, SMS, Unified Communications, Call Recordings, Windows & Mobile Apps (iPhones / Android), Voicemail Transcriptions, Call Reports, Hot Desking, Barge In/Listen/Whisper, CRM/ERP/Microsoft 365 Integrations, Skill Based Routing, High Availability Failover setups, SBCs (Session Border Controller).. the list goes on.