can't stop a telemarketer, then they sure as hell can't stop a terrorist.
For the 99.9% of the folks here who don't know.... Let me educate:
There has been significant recent legislation, and TENS OF MILLIONS spent by the telecoms to eliminate robocalls and telemarketers.
Guess what! The major carriers don't those calls any more than we do.
The are "short duration calls" that tie up networks and generate no revenue.
Google "STIR/SHAKEN"
The war is on against the telemarketers. The battle is new, but give it time...