Learn more about Call Blocking devices

Yes, Caller ID must be enabled on your phone line by your provider for the product to work effectively. Without Caller ID, the Call Blocker will block ALL calls.

Yes, the CPR Call Blocker will work with a wide range of telephone equipment, including corded analog phones and cordless DECT phones.

Yes, The CPR Call Blocker will work on all standard domestic telephone lines from the main US telephone providers.

The CPR Call Blocker uses very little power from your telephone line. If you have copper line service, the power comes from your service provider.

No, it won’t. The major suppliers of panic alarm devices have all indicated that their products are compatible with CPR Call Blocker. They do request that when you purchase one, you give them a call to let them know that you are connecting a call blocker device to it.

Yes, you can manually program the CPR Call Blocker. However, using the unique CPR “BLOCK NOW” button is the easiest way to block an unwanted number.

Yes, The CPR Call Blocker shouldn’t interfere with your answering machine’s functions, but if it does, you can adjust the number of rings required for the machine to work. We recommend setting your answer machine to five rings or less.

It doesn't work directly on Digital PBX Hybrid switchboard systems, but it will work on systems where an analog handset is plugged into the call group. Email us for more information regarding this at support@cprcallblocker.com.

Yes, you can, but issues may occur. If you need multiple landlines around the house, we suggest that you use a Digital Enhanced Cordless Telephone (DECT). The DECT provides multiple cordless handsets connected to the main base station at the master socket.

No, they will only get blocked if you manually program the unit to block all international calls.

No, they will only get blocked if you manually program the unit to block all withheld calls.

Yes, the CPR Call Blocker will work with all types of broadband connections, whether fiber -optic or DSL. Just unplug your telephone and plug it into the CPR Call Blocker.