3CX

3CX develop the popular software based PBX for Windows, 3CX Phone System that completely replaces a traditional PABX. 3CX also develops 3CXPhone, a free SIP VoIP Softphone for Windows that includes all features require for a business.

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3CX
Free
3CX: Powerful Unified Communications for Any Business
Windows
3CX
Free
Efficient Communication with 3CX for Android
Android
3CX
Free
3CX Communications System: Enhance Team Connectivity
iOS