First, the Do Not Call list does not stop any calls that are dialed regardless of where they originate. It requires the caller to screen numbers against the list although all automatic dialers can be loaded with the DNC list for the target area code(s) and be programmed to skip numbers on the list. Second, foreign entities wishing to conduct telephone sales campaigns in the US are required to register with the FTC and utilize the list the same as US companies. It is just much harder to go after foreign violators unless their country cooperates with the US.