Twilio Voice API is used to record calls with a voice-enabled number, and the storage space should be kept below the chargeable limit to prevent added cost. The recording management can be automated using the recording status callback, download recordings programmatically via the REST API, save the recordings in Dropbox, and delete the recordings programmatically via the REST API. A PHP development environment Laravel is used for this tutorial, which includes installing Twilio SDK for PHP, purchasing a voice-enabled Twilio phone number, setting environment variables, creating routes to generate TwiML for outbound and inbound calls, saving the recording in Dropbox, and deleting the recordings. The complete code for the tutorial can be found on Github.