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TBR21 is a European telecommunications standard published by ETSI, and is the standard to which all telephone equipment must adhere to, to be allowed connection to Europe's public switched telephone network.[1]

It is somewhat equivalent to the US part 68 standard.

TBR-21 has been replaced by the new ETSI standard ES 203-021[2]

The "advisory notes" (ATAAB notes) are no longer being maintained.