@vogelchr @LaF0rge Likely, or just a passive adaptor...

Personally I wished it was an "#AnnexB" style #HyTNAS with #POTS/#PSTN + #ISDN on the same lines but that doesn't work with Uk0.
https://de.wikipedia.org/wiki/G.992.1#Annex_B

I wounder if #56k-#dialup & #ISDN-Dialup #Internet access is also implemented for some #RetroNetworking.

I mean 14,4k Fax should just work out of the box tho.