VocalSmart

VocalSmart Inc. builds innovative SIP-based IP phones, IP videophones, IP PBX and Mobile solutions for service providers, enterprises, OEMs and end users.

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vSmart Win7
Free
Make free USA/Canada calls on PC and Android devices using Google Voice and IPKALL.
Windows
vSmart XP
Trial version
Make free USA/Canada calls on PC and Android devices using Google Voice and IPKALL.
Windows
VsmartDroid
Free
Make free USA calls from anywhere in the world on Android devices, by using home PC as gateway.
Android