Message Callback refers to the ability to setup a webhook or http callback to notify your server of a message event (message received, message delivered, message delayed).
How Bandwidth is Involved with Message Callback
Bandwidth’s APIs can be configured to send message callbacks to a message callback URL.
What Are the Benefits of Bandwidth’s Message Callback
Combining both a voice and messaging callback (webhook) together is one of the first steps to integrating texting and calling to your application.