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Standards [CURRENT]

DIN ETS 300358

Integrated Services Digital Network (ISDN) - Completion of Calls to Busy Subscriber (CCBS) supplementary service - Functional capabilities and information flows; English version ETS 300358:1995
Edition 1996-04

Standards [CURRENT]

DIN ETS 300203

Integrated Services Digital Network (ISDN) - Call Forwarding Busy (CFB) supplementary service - Functional capabilities and information flows; English version ETS 300203:1994
Edition 1995-06

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