3CX has released the enterprise edition of 3CX Phone System that replaces the proprietary Private Automatic Branch Exchange (PABX). It works on the open Session Initiation Protocol (SIP) standard and interoperates with a wide range of SIP phones, Voice-Over-Internet Protocol (VOIP) Gateways, and SIP-based providers.

3CX Phone System implements enterprise telephony features such as call queuing and Exchange 2007 integration. Call queuing allows companies to hold callers in a queue, while agents answer their calls.

Exchange 2007 integration allows 3CX Phone System to use the unified messaging server in Exchange Server 2007 as the voice mail server.