I changed out phone system to the Panasonic and can now block up to about 150 calls. Also got a call from 321-296-9648 and blocked it. I am tired of constantly getting calls and they never identify themselves on answering machine.
I have a Panasonic phone, but the blocked call list fills up at 250 calls, so you have to go back and delete maybe 100 of the older blocked calls when it fills up. I still have that phone, but have recently added an additional call blocker that blocks 1200 numbers. But it will block entire area codes. There are about 350 area codes in the US and I have about 310 of them blocked now. Made by CPR.