Q.400-Q.490�:�Specifications of Signalling System R2

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Q.400-Q.490�:�Specifications of Signalling System R2 �

Recommendation Q.400-Q.490 (11/88)

Approved in 1988-11-25

Status : In force

�	Table of Contents
�	Summary
Initially published in Blue Book Fascicle VI.4 (1988). Available now in electronic format only

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2002-07-24

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2002-07-24

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2002-07-24

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