TringMe API

From their site: Create rich web-based, standalone or mobile voice applications and recreate a lot of TringMe’s functionality. For example, Social networking, Dating sites can easily integrate voice as a means of communication in innovative ways, VoIP providers can quickly deploy and offer their services using TringMe’s easy to use Adobe-Flash based web-phone or mobile devices enabled via cheap to use Mobile-VoIP, Game developers, virtual world creators can enable making phone calls from virtual world to real world and vice-versa.