Developer's DescriptionBy VocalSmartMake free USA calls from anywhere in the world on Android devices, by using home PC as gateway.VsmartDroid is a SIP gateway client for Android. It has a built-in support for Google Voice and IPKALL. By working with SIP gateway on PC or stand alone ATA (Analog Telephone adaptor) device at your home, you can make and receive free calls on your Android tablet from anywhere, any time.