Hi Colin, [snipped] > > o Applications SHOULD register and use a service code specific to the > > application. > > To the application, or to the protocol? The RTP-over-DCCP draft uses > service codes specific to the protocol, for example. [Tom P.] Good question -- I don't know the answer. I was using application loosely here and didn't necessarily think of that distinction. I'm quite happy with what RTP-over-DCCP has done, and if you look at Eddie's earlier post in this thread the example he uses to illustrate two things that'd use different service codes (HTTP/1.0 and HTTP/1.1) are two different protocols that do the same application. Or maybe I should say applications -- there are a lot of applications masquerading as web browsing out there. If TCP had service codes, should my SSL VPN masquerading as HTTPS on port 443 have its own service code?