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Joined: Jan 2004
Posts: 6,648
RIP Moderator-Nisuko-Tie, General
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RIP Moderator-Nisuko-Tie, General
Joined: Jan 2004
Posts: 6,648 |
polarity guard would be my guess
early Western electric TT sets where polarity sensitive , a polity guard allowed DTMF to work regardless of polarity
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