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@Garage, GvonSprout
Well, yes, the protocol was explained. And it would, at least as I understand it require someone to set up the hardware to know where it was built into. Now, as an airline having the stuff installed but not using it (after all my 777 fleet does all the regional flights with VHF coverage losses for never more than 30 minutes), why would I bother to set the boxes up? Why would I know about how to do that it the first place if I do not require the service? How do I know of the detailed technical operation of the stuff if I don't use it?
The protocol does only say there is a space for the aircraft reg, but it does not say that the box may operate on a default setting prior to the effective registration of the box with Inmarsat.
If the whole regional 777 fleet of MAS have the same default setting the information is not valid.