Hi Dean, 

>>Params only seems to tackle the parameter loss issue, and it seems 
>>further to solve a different problem alltogether i.e. how to get 
>>parameters from the caller to the callee.
>
>Well, that WAS the original goal of US-Loose-Route, and is the thing we
have a chartered milestone for:
>
>From our charter:
>Feb 2008
>Delivering request-URI and parameters to UAS via proxy to IESG (PS)

I believe the UA loose mechanism works in the same way as the Target
mechanism in that sense: if a retarget occurs, the Request-URI is
overwritten, and the R-URI carries the current target.

Regards,

Christer

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