Instead of Voxbi
Voxbi alternatives
Apps that do what Voxbi does, from the business phone systems list, the ones you can start free with first.
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PortSIP PBX
Free plan AndroidAPIiPhone+4 - 3
FreePBX
Free plan AndroidiPhoneLinux+2 - 4
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Freshcaller
Free plan AndroidiPhoneWeb - 7
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CallHippo
Free plan AndroidExtensioniPhone+3 - 9
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4PSA VoipNow
Free plan APILinuxSelf-hosted+1 - 11
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sipXcom
Free plan APILinuxSelf-hosted - 17
FusionPBX
Free plan APILinuxSelf-hosted+1 - 18
VoIP Business Enterprise
Free plan AndroidExtensioniPhone+3 - 19
Incredible PBX
Free plan LinuxMacSelf-hosted+2 - 20
MikoPBX
Free plan APILinuxSelf-hosted+1 - 21
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Palephone
Free plan AndroidAPILinux+3 - 23
Phonebooth
Free plan AndroidiPhoneMac+2 - 24