Can I use The CPR Call Blocker with extension telephone sockets?

Can I use The CPR Call Blocker with extension telephone sockets?

Yes, you can but problems can arise. 

If you wish to have several phones around the house it is better to use a modern DECT (Digital Enhanced Cordless Telephone) where the main phone has a base station with multiple cordless handsets. 

This way The CPR Call Blocker can protect all of the phones linked to the main base station at the main master socket to avoid problems with intermittence and ringing issues when using separate phones on different sockets, which only complicates things and could overload your line.
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