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ITU Recommendations I.430, Q.920, Q.921, Q.930, Q.931
FTZ Richtlinie 1TR3, Band III
ITU Recommendation Q.932 (03/93), Q.950 (03/93)
ETSI Recommendation ETS 300 179 (10/92), ETS 300 180 (10/92)
ETSI Recommendation ETS 300 181 (04/93), ETS 300 182 (04/93)
ITU Recommendation X.208, X.209
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