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by maddawg
Sat May 18, 2002 9:59 pm
Forum: General Discussion
Topic: telephone block for outgoing calls
Replies: 1
Views: 733

telephone block for outgoing calls

I remember reading an article about building a phone line monitor that will block outgoing calls to a specific number or area code. I believe it was in NUTS AND VOLTS or ELECTRONICS ILLUSTRATED.I would like to build one of these devices. Any suggestions would be appreciated.