call barring circuit

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

This forum is devoted to discussion of Keil tools, not a begging ground for hopeless students.

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

"I'm doing a project using this circuit"

How can you be "doing" a project with the circuit, if you don't even known what the circuit is?!

What is the nature of the project?
What exactly is your involvement with the project?