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  1. kittychuk3

    About TDA 100 DDI Problem

    Rivet Thank you for your support. But I have change the DDI card. But it can't fix the problem. Thanks KT
  2. kittychuk3

    About TDA 100 DDI Problem

    Hi all, I have installed a TDA-100 Telephone System. The system have DDI function and circuit. But I can't use the DDI. A people(A) call DDI to user(B). People(A) can't hear "Ring Back Tone when dailing completed. But user can hear ringing and he hang up the phone. But user(B) and people(A)...

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