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ISDN Specifications

Unfortunately there are many dialects of ISDN. This was common-place in the old national PSTN networks even before ISDN, so it seemed "normal" at the time.

International / ITU-T (formerly known as CCITT)

Europe / ETSI

Etsi specified what was later known as "Euro-ISDN".

Germany

In Germany, there was a national ISDN dialect called 1TR6, which was later obsoleted by Euro-ISDN. See German_FTZ_ISDN_Specifications.

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