Our API directory now includes 73 voice APIs. The newest is the Ivona API. The most popular, in terms of mashups, is the Twilio API. We list 340 Twilio mashups. Below you'll find some more stats from the directory, including the entire list of voice APIs.
At the AT&T Developer Summit in Las Vegas, AT&T made several announcements which included the launch of a new Call Management API, the launch of a new Alpha API Program and several AT&T API platform updates.
Right on the heels of the Twilio Client that developers can use to add Skype-like capabilities their mobile or web apps, the company is is launching a supporting virtual phone system built on its Twilio API. OpenVBX, along with the Twilio Client, provides a complete web-based business phone system, similar to Google Voice.