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3CX
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<p>3CX, Inc., is a software development company and developer of the 3CX Phone System. </p><p>The 3CX Phone System is a software <a href="/facts/Private_branch_exchange/eLWvlhzs">private branch exchange</a> based on the SIP (<a href="/facts/Session_Initiation_Protocol/cbjUoNqP">Session Initiation Protocol</a>) standard to allow calls via the <a href="/facts/Public_switched_telephone_network/eVrCTDU7">public switched telephone network</a> (PSTN) or via <a href="/facts/Voice_over_Internet_Protocol/5QGBbXYg">Voice over Internet Protocol</a> (VoIP) services. </p>