3CX is a software-based, open standards IP PBX that offers complete Unified Communications, out of the box.
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Microsoft Exchange Server
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What is 3CX Phone System?
3CXPhone is a free VoIP phone available for Windows, iPhone or any Android based smart phone such as Google Nexus, Sony Xperia, Motorola Droid or Samsung Galaxy. Connect 3CXPhone to a VoIP provider or to a VoIP PBX (for example 3CX Phone System) to make calls to any VoIP, mobile or landline number.
Use popular VoIP providers and SIP trunks for low cost calling Use popular IP Phones (Polycom, Grandstream, Yealink, Cisco & others) or Softphones Keep using your old telephone lines with the use of VoIP gateways Runs on Microsoft Windows - no need to dedicate a PC or learn Linux! Eliminate phone wiring Includes enterprise phone system features such as voicemail, auto attendant, unified communications and more 3CX Phone System FREE edition is a fully functional product - it supports an unlimited number of extensions and does NOT time out. It is supported only via the 3CX Forums.