How important is revision nr of tdm400p?


I’m just about to order a tdm400p (tdm13b) at
on the forum, I think I read (can’t find it anymore) there was an issue with rev. H and faxing. faxing will be very much needed.
The seller told me the TDM chip carried a tag “rev. G”

Is this ok or should I ask for a newer version ? And which would that be?