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I need same functionality as yootok.com
It uses a fully outsoucerd API of twilio http://www.twilio.com/docs/quickstart/php/ios-client/make-outgoing-call
It combines the IOS app design and API calls as well as the server with a php configuration script.
See all functionalities in app purchase credit, coupon credit add, outgoing calls..
Please download the app and provide a budget for the full functionalities.