Каталог DIN — национальные стандарты Германии
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DIN ETS 300356-6-1995
Integrated Services Digital Network (ISDN) - Signalling System No. 7; ISDN User Part (ISUP) version 2 for the international interface - Part 6: Connected Line Identification Restriction (COLR) supplementary service (ITU-T Recommendation Q.731, clause 6 (1993), modified); English version ETS 300356-6:1995
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