Is there a call consumption alert?

Yes! Just head over to the developer’s dashboard and click on the Call Consumption Alerts tab to enable it.

Note that users will receive an email once the threshold value of 50% and 90% is hit respectively.

Asides from the optional 50% and 90% call consumption alert, there is a default alert for 80% and 100% call consumption. Hitting the 100% call consumption also triggers the start of the billing for Overage Charges.