Perhaps. When OSI was still a going concern I was far too young to have paid attention. Glancing at the PDF for the X.224 spec[0] I see things like "The initiat

Perhaps. When OSI was still a going concern I was far too young to have paid attention. Glancing at the PDF for the X.224 spec[0] I see things like "The initiator may assign the transport connection to an existing network connection of which it is the owner or to a new network connection (see Note 1) which it creates for this purpose." In X.225[1] I see some references to re-using transport connections. (Egad, the ITU documentation is much less fun to read than RFCs.) It certainly looks like the layering in the OSI protocols is taken nearly to the absurd. I do know Vint Cerf has stated using the IP address as the connection endpoint identifier in TCP and UDP was a mistake.[2] [0] https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.224-199511-I!!PDF-E&type=items https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.22... [1] https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.225-199511-I!!PDF-E&type=items https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-X.22... [2] https://youtu.be/t9M0RPNr9qg?t=2229 https://youtu.be/t9M0RPNr9qg?t=2229