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DKE German Commission for Electrical, Electronic & Information Technologies of DIN and VDE

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Technical rule [CURRENT]

ITU-T Q.721
Functional description of the signalling system no. 7 telephone user part (TUP)

Title (German)

Funktionelle Beschreibung des Fernsprechnutzerteils (TUP) des Zeichengabesystems Nr.7

Edition 1988-11
Original language English
Price On Request
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