RE: [Sip] Vocabulary and problem statement for Request-URI,retargeting, and SIP routing (long, but read it!)

[Hadriel Kaplan <[e-mail]>]

Hey John,
Inline...

> -----Original Message-----
> From: Elwell, John [mailto:[e-mail]]
> Sent: Friday, January 18, 2008 2:48 AM
> >
> > But in the re-targeting scenario such as:
> >                     RTRG                    RRT
> >                    +---+                   +---+
> >                    |R1 |                   |R2 |
> >                 B /+---+\ C             E /+---+\ F
> >             RT   /       \  RT      RT   /       \  RT
> >            +---+/         \+---+ D +---+/         \+---+
> >            |P1 |           |P2 +---+P3 |           |P4 |
> >         A /+---+           +---+   +---+           +---+\ G
> >          /                                               \
> >    +---+/                                                 \+---+
> >    |UAC|                                                   |UAS|
> >    +---+                                                   +---+
> >
> > UA-Loose-routing wants the req-uri seen on connection "C" I think.
> > To header gives you A.
> > PCPID gives you E.
> > Hist-Info gives you A,B,C,D,E,F.
> [JRE] According to Dean's definition of RT, it does not change the
> Request-URI (only the Route header field presumably, or maybe not even
> that).
> So C, D and E are the same. Also A and B are the same, and F and G are
> the same.
> So I think:
> - UA-Loose-routing gives you C/D/E
> - To gives you A/B
> - PCPID gives you C/D/E
> - Target gives you C/D/E
> - Hist-info gives you A/B, C/D/E and F/G.

Yes, I agree that is the *theory*.  :)
I drew it that way though so we could argue about what the UAS/UALR-draft _wants_ to happen vs. what _will_ happen if P2 or P3 are not purely RT's and didn't support a new draft. (Since it seemed the conversation was going that way previously on this list, for example when Christer pointed out the difference between Target and PCPID)

For example, I think there is more than just a syntax difference between Christer's sip-target-uri-delivery draft (STUD?) and Jonathan's UALR approach.  Though I have no idea which one is better.

-hadriel



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