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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VsmartDroid
Free
Make free USA calls from anywhere in the world on Android devices, by using home PC as gateway.
Android
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