CPR Call Blocker's red LED lights flash every 30 minutes

CPR Call Blocker's red LED lights flash every 30 minutes

Some telephones like BT DECOR models check your 1571 network voicemail service for messages on a regular basis - these are called 1571 phones. They automatically pick up the line a few moments after the end of each call, and then every 30 minutes during the day and night. Call Blocker’s red LED lights are there to tell you that your phone line is in use, so a 1571 phone will make this light up at regular intervals. This will cause problems with the call blocker and cause it to malfunction, so we recommend that you don't use 1571 phones with Call Blocker.

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