Plivo GetInput XML comes with inbuilt support for Automatic Speech Recognition. 

You can use GetInput XML to prompt users for inputs, and to gather their voice responses in real time.

Gathered speech is transcribed and forwarded to the specified Action URL instantly. 

You can control the speech recognition behavior using GetInput XML parameters such as speechEndTimeout, executionTimeout, hints, and speechModel. 

To learn more about Automatic Speech Recognition with GetInput XML, check out the detailed reference documentation here.