steve%cs.ucl.ac.uk@BRL.ARPA (07/16/86)
Tommy, Are we sure that CCITT is making the big mistake that everyone seems to claim that it is making. As you well know, I strongly agree that doing lists at the P2 level is the only reasonable approach. Now CCITT are definitely proposing doing distribution lists in the MTL. The key thing here is that by doing it in the MTL, the PTTs can charge for list expansion as a value added service. However, the Reston output (I have not yet seen the Melbourne stuff) notes "although its expansion point resides in the MTS, a DL bears some resemblance to a UA....". It strikes me that what is going to happen is that CCITT will define a P2 level (correct) functionality, and then say it belongs within the MTL. This is exactly the same architectural fudge as they made for content conversion. It all boils down to the fact that money and politics have a much stronger influence on CCITT than having a clean model. Steve