| Axon Free Virtual PBx System | Axon Business Virtual PBx System | PCBest Networks SIP PBX | Express Talk Business VoIP for Pocket PC | |
| 2.20 | 2.22 | V2.01 | 4.01 | |
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| Freeware | Shareware | Freeware | Shareware | Licence |
| FREE | $195.00 | FREE | $49.99 | Price |
| 1.22 MB | 1.25 MB | 4.04 MB | 1.26 MB | File size |
| May 18, 2011 | Mar 2, 2016 | Jul 22, 2009 | Oct 26, 2009 | Update |
| 23 | 22 | 13 | 25 | Downloads |
| Windows 8, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows XP, Windows 10, Windows 11 | Windows 8, Windows 7 x32, Windows 7 x64, WinOther, WinServer, Windows Vista, Windows XP, Windows 10 | Windows 2000, Windows XP, Windows 2003, Windows Vista, Windows Vista | Other, WinMobile, Windows CE, Pocket PC, Handheld/Mobile Other, Windows Mobile 2005 | OS |
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