This is somewhat good idea of how standardization works, but in this case it is not entirely correct. The argument there was essentially that ATM with E1-like f

This is somewhat good idea of how standardization works, but in this case it is not entirely correct. The argument there was essentially that ATM with E1-like framing (and thus somewhat different and longer header) could be used across whole france for voice beare channels without echo cancelation. The 5+48 byte with HEC framing variant at least in theory also satisfies this (somewhat nonsencial) requirement.