X.25 Type Numbers

Last Updated

2007-08-30

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• X.25 Type Numbers

X.25 Type Numbers

Registration Procedure(s)

Not assigned by IANA

Reference

[N/A]

Note

ITU-T TSB defines the high order two bits of the first octet of call user
data as follows:

00 - Used for other ITU-T TSB recommendations (such as X.29)
01 - Reserved for use by "national" administrative
     authorities
10 - Reserved for use by international administrative authorities
11 - Reserved for arbitrary use between consenting DTEs

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