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 XP
Trial version
VocalSmart: Free Calls with 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
vSmart Win7
Free
Efficient VoIP Software for Windows Users
Windows