Alexa Voice Service v20160207. The Alexa Voice Service (AVS) allows developers to enable voice interactions on connected products. After integrating AVS, your product has access to the built-in functionalities of Alexa, such as music playback, timers and alarms, package tracking, movie listings, and calendar management.
https://developer.amazon.com/en-US/docs/alexa/alexa-voice-service/api-overview.html