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U.15�:�Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12 �

Recommendation U.15

In force components
Number
 Title Status
U.15 (03/93)
� 		Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12 � In force
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Superseded and Withdrawn components
Number
 Title Status
U.15 (11/88)
� 		Interworking rules for international signalling systems according to Recommendations U.1, U.11 and U.12 � Superseded

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