AstCallBack Lite is an application running for iPhone allowing to use Asterisk's callback functionnality.
The application allows the user to dial a number, get the history of previous calls but also let him access to the contact list.
When the user dials a number, the application will contact the asterisk server via http protocol, get the server the required informations and check for its answer. If the answer is correct, the server will firstly dial the phone number specified into the application's preferences. Once the user has answered the call, the server dials the second number, making a relationship between the user's phone and his contacts.