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3CX Phone System for Windows FreeScreenshot 

 

3CX Phone System for Windows Free edition is an IP PBX that completely replaces a proprietary PBX, supports standard SIP soft/hard phones, lowers call costs via VOIP service providers whilst still supporting traditional PSTN phone lines. Developed for Windows - Easy to install and configure! Scaleable to thousands of extensions & eliminates the phone wiring network. Download FREE edition with no limitations or time outs.

Screenshot of 3CX Phone System for Windows Free