| Voicent Flex PBX | Axon Business Virtual PBx System | Axon Free Virtual PBx System | PCBest Networks SIP PBX | |
| 9.0.5 | 2.22 | 2.20 | V2.01 | |
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| Freeware | Shareware | Freeware | Freeware | Licence |
| FREE | $195.00 | FREE | FREE | Price |
| 0.27 MB | 1.25 MB | 1.22 MB | 4.04 MB | File size |
| Oct 23, 2013 | Mar 2, 2016 | May 18, 2011 | Jul 22, 2009 | Update |
| 14 | 22 | 23 | 13 | Downloads |
| Windows XP, Windows Vista, Windows Vista x64, Windows 7 x32, Windows 7 x64, Win2000, WinServer | Windows 8, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows XP, Windows 10 | Windows 8, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows XP, Windows 10, Windows 11 | Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows Vista | OS |
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