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my project is making a small telephone exchange have 5 lines , 4 lines for 4 local telephone extensions , 1 line go through to general network !


my project is making a small telephone exchange have 5 lines , 4 lines for 4 local telephone extensions , 1 line go through to general network !

I need any document about this topic , diagram , block diagram, circuit ,ect .

Anything concern on my project , i will rate live save !

Thank you in advance

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