Another way to prevent neighbor-spoofed robocalls
Bad actors often spoof caller ID with numbers that are like the called number, a tactic called neighbor spoofing. Here’s a simple method to block such calls that we’ve found can be quite effective.
In a typical neighbor spoofing situation, the bad actor might spoof caller ID that resembles the NPA-NXX of the called number. For example, if the called number will be 205-555-1212, then the spoofed caller ID might be 205-555-1000.
Often, the terminating service provider (TSP) is assigned both the called number and the neighbor-spoofed caller ID. In those situations, the TSP wouldn’t expect to see a call arrive at the edge of their network, i.e., it wouldn’t be an off-net call.
Instead, the TSP would expect to see such a call routed within its network, i.e., it would be an on-net call.
The prevention method, then, would be for the TSP to inspect the caller ID for calls that arrive at the edge of its network, typically an SBC, and see if the caller ID is one of its numbers. If it is, and the number is not a roam-able wireless number, and the number is not a business number that might be used by a distant call center, then the TSP could safely block that call.
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