special phone

Out of context: Reply #7

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  I'm a swiss-federal-tested-electrical... ™
  (no honestly, I am)

  There are numerous Textbooks available in Switzerland, not sure if you read German or not... (if you read German search for a/b draht that should give you a start)

  But really I would strongly advise against DIY when it comes to phones.... the line itself is less critical...

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