The CPR All-IN-ONE Call Blocker is easy to set up & easy to use. You decide who you want to speak to. The CPR ALL-IN-ONE is the only Call Blocking product to have its own its built in Rogue Calling numbers list supplied by the Call Prevention Registry which prevents silent calls, robo calls, recorded messages, overseas call centres, harassment calls, malicious calls, junk faxes & withheld numbers. Companies which are selling by phone, using overseas call centres & automated sales lists are all pre-programmed which will minimize the sales calls you receive almost immediately. The All-IN-ONE works on any home phone line, even with additional handsets & broadb&. The ‘ Block Now’ button is located on the top of the unit. At the touch of this button the unwanted caller’s number is logged into the unit’s memory, hang up the call & the number is blocked permanently. Use this feature to block unwanted callers as they are calling you. The anonymous caller reject feature will reject any caller who withholds their number. The CPR Call Blocker will also work on Digital PBX systems with analogue sockets- Simply Put Call Blocker into a Call Group with an Analogue Handset. CPR Call Blocker stops: Silent Calls PPI Calls (New function) Recorded Messages Overseas Call Centers Harassment calls Robo Calls Unavailable Calls VOIP Nuisance Callers International Calls Withheld numbers