Green Dialer is a Mobile VoIP dialer application that allows to make VoIP calls from any of the Android devices and it uses 3G/Edge/Wi-Fi Internet connectivity. It is developed based on the requirements of VoIP Providers business needs. Features: It uses SIP protocol based for signaling. Supports G729, PCMU, PCMA codecs. Runs Behind NAT or private IP. User Friendly Interface.