Android App (SIP + Radio)

We are looking to develop an application, where users can listen Radio from different categories of channels e.g. counties wise... and can do voice chat with selected users. Features: - App will be for Android, iPhone and iPad - User can register and having there profile - User can listen free Radio and paid - User will have limited free user for voice chat and for paid user unlimited - Admin will have a control panel (CMS) to add more categories, add more radio channels, can set subscriptions.