We tried two models of CPR call blocker and couldn't get them to work stably (had to keep disconnecting and reconnecting to reset, but then only worked briefly). The company claimed it had something to do with providing our phone service through Comcast. But the Panasonic model works well. Not sure why, but it could be because this unit has its own power supply. Yes, and it's much better built. If this is your first call blocker purchase, I would suggest going with Panasonic.
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