Petra is a VoIP application which allows you to make international calls at the best price and with excellent voice quality. It works on all 3G/4G/Edge/Wi-Fi networks.

Features:
Easy to Register.
Provides Calls to All Countries Wolrd Wide.
Just Type the Destination Number or Select from Contacts to Show the Balance Minutes.
Supports G729, PCMU, PCMA Codecs.
Runs Behind NAT or private IP.
User-Friendly and Simple Interface.
Auto Sync of Balance Minutes After Each Call.
Call History.
Address Book Integration.