Hello,
my question regards authentication dialog during redirected call.
(sorry, if it was already discussed, I didn't find something about this 
scenario)
 
Let's say there are two servers AA and BB. AA is registered and client sends to 
it INVITE. Now AA redirects the call to BB. 
Question 1. Should BB also be registered as separate target with own 
credentials? Or maybe it depends on Client? 
Generaly I don't see why it should be - New target address is found by AA, 
Client sends Invite so it doesn't ask about authentication on this stage.
 
Now Client sends INVITE to BB. Neither AA no BB ask authentication and BB 
receives INVITE. Call is established. After P&C dialog BB sends REFER to 
Client. 
Here Client answers with 407. 
Question 2. What credentials should be used by BB? Can it be AA credentials?
 
Thank you
Masha Dorfman
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