The RingCX Callback feature currently allows users to enter an alternative number for a callback, with the sole restriction being that the number must originate from the same country as the inbound ANI country code.

However, there is a potential risk of abuse by malicious actors or scammers, who could exploit this feature to generate revenue for themselves by using premium rate numbers for the callback, resulting in financial implications for our customers.

To mitigate this risk, I would like to suggest implementing the ability to restrict specific numbers from being used for callbacks by creating a blacklist.