The Voxbone WebRTC PHP Sample Code by Voxbone demonstrates how to interact with the API to access telephony features. API documentation available at https://developers.voxbone.com/docs/webrtc/overview/
Telephony and voice APIs are one of the most active segments of the API and mashup world. For example, in the past week, two of the latest mashups in our directory use telephony APIs in innovative ways (the directory has 42 telephony-related APIs):
We already use Twilio as an example of documentation done right, but the company thought it could do better. The company now provides a unique telephone number for every new signup to use immediately with the Twilio Voice API and Twilio SMS API. Previously there was a single shared number that required a pin. Now Twilio is showing off one of its core features immediately and making it much simpler to get started.