Dean Willis writes:

 > >> If Bob forwards his phone to Charlie, Alice needs to see something  
 > >> signed by Bob or somebody authoritative for Bob that says the call  
 > >> is being redirected to Charlie before accepting a response from  
 > >> Charlie.
 > >
 > > I agree this would be a good thing. It doesn't have to be the 3xx  
 > > response.
 > 
 > Correct. There have been other proposals, such as a reliable  
 > provisional informing Alice that an authorized proxy has retargeted  
 > the call to Charlie. This isn't hard -- it takes only a new response  
 > code and minor mods to RFC 4474. Or it could be done with no new  
 > extensions using an accept/refer/disconnect model.

and how about if charlie decides to forward the call to bill, who bob
doesn't trust?

-- juha
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