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call barring circuit

Need help...Does anybody have a circuit diagram for call barring?...I'm doing a project using this circuit...tnx

Parents

0 Drew Davis over 20 years ago in reply to John Donaldson


     | |
   +-||||-------------+
   | | |              |
   |                 phone
   |                  |
   +-------\  --------+
                        ^ call barring device
              (US patent pending)

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0 Drew Davis over 20 years ago in reply to John Donaldson


     | |
   +-||||-------------+
   | | |              |
   |                 phone
   |                  |
   +-------\  --------+
                        ^ call barring device
              (US patent pending)

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