Vkoll is the Mobile Dialer that allows to make VoIP calls from any of the android devices and Vkoll uses 3G/Edge/Wi-Fi Internet connectivity. Vkoll is developed based on the requirements of VoIP Providers business needs. Vkoll Features:- It uses SIP protocol based for signaling Supports G729, PCMU, and PCMA codecs Runs behind NAT or Private IP User Friendly Interface Auto Sync of Balance Real Time Sip status messages Call History Address book integration Call Recording Automatic Call Recording Compatible with all sip standard switches Vkoll has very efficient implementation of jitter buffer to play voice smoothly. Silent suppression and comfort noise generation has been used to reduce the bandwidth usage, and this makes the dialer more efficient in making VoIP calls.