Voicemail, unified messaging, computer telephony integration (CTI), contact centre, interaction management, PC phone, PC console, presence management, directories, automated attendant, interactive voice response (IVR), session initiation protocol (SIP) systems, PBX, telephone systems, data systems, data networks, data security, virtual private network (VPN), reporting, management information systems, call accounting, all-in one communications appliance, software development, customer relationship management (CRM), predictive dialling, power dialling, telecommunications software