3CX is an international VoIP IPBX software developer. Its 3CX Phone System, an open-standards, software-based PBX, was initially only deployable on Windows but as of 2016 can be deployed on Linux and on cloud platforms. 3CX can be integrated with multiple CRM systems. 3CX is headquartered in Cyprus possessing presence in multiple locations across the globe, including Australia & New Zealand, Brazil, Canada, France, Germany, Italy, Mexico, Netherlands, Russia, Singapore, South Africa, Spain, Switzerland, United Kingdom and United States.