The 3CX Phone System is the software-based private branch exchange (PBX) Phone system based on the SIP (Session Initiation Protocol) standard and enables extensions to make calls via the public switched telephone network (PSTN) or via Voice over Internet Protocol (VoIP) services on premises, in the cloud, or via a cloud service owned and operated by the 3CX company. The 3CX Phone System is available for Windows, Linux, Raspberry Pi, Android and iOS and supports standard SIP soft/hard phones, VoIP services, faxing, voice and web meetings, as well as traditional PSTN phone lines. 3CX Phone System consists of a number of software-based components. The PBX, accessed and managed via a web-based management console, softphone for Windows, and smartphone clients for iOS and Android. The phone system can be used with either SIP phones or the clients, or a combination of the two. The PBX provides unified communications functionality including presence, chat, voicemail to email, fax to email, integrated video conferencing, call conferencing, Live Chat, SMS, and additional integrations with Facebook and a number of CRM platforms.