Re: I am not sure if this is possible ...
The solution, IMHO, is for the landline carriers to exert some form of control over VOIP gateways. Particularly those whose call profile indicates a large number of short duration calls.
You cannot tell me they do not know who these VOIP gateway providers are. They are paying (ah! there's the rub) for trunk groups. The call profiles are known, and I would submit that a robocaller's call profiles are distinctively different from legitimate VOIP gateways.
So, put some effort into it and these people can be stopped.
Biting the hand that feeds IT
