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):
Call Loop, web-based voice and SMS solution provider, offers the Call Loop API that allows developers to add Call Loop’s calling and SMS features to third party apps. Often referred to as the “Constant Contact” for voice and text, Call Loop focuses on broadcast communications. Businesses or individuals can reach subscriber bases via voice or text messages.