Page "ISDN User Part" Paragraph 34
from
Wikipedia
Release codes are used to identify and debug any events occurring in ISDN User Part signaling.
Every event in ISUP signaling generates a release code number.
Even for a normal ISUP call, a release code is generated.
There are lot of applications developed based on the release code from ISUP signaling.
Similarly Telecom operators trace for Release codes to debug any call failures.
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