Hi,

I am looking at XECS-1809 Remove P-Asserted Identity authentication for 
NOTIFYs. I talked with Scott today morning regarding this, and he suggested we 
change the way how sipXproxy determines if a REQUEST needs PAI authentication.

- Currently, REFER, BYE, OPTIONS, SUBSCRIBE, NOTIFY, and out-of-dialog INVITEs 
are challenged by sipXproxy
- Change this, so that all out-of-dialog REQUESTs are challenged, and in-dialog 
REQUESTs go through unchallenged 
- With an exception for REGISTER, as sipXregistrar is in a better position to 
authenticate them. So, no REGISTERs are challenged.
- And an exception for OPTIONS, as they are great for debugging, so, we will 
not require any authentication from them either.

- We use the presence of To-tags to test whether a request is in dialog or not

Any comments on this?

Also, we couldn't come to a definite conclusion for REFERs. Should we 
authenticate in-dialog REFERs? How about out-of dialog REFERs?  


Thanks,

Arjun

Reference -
XECS-1809: http://track.sipfoundry.org/browse/XECS-1809
REFER RFC: http://www.ietf.org/rfc/rfc3515.txt
PAI RFC: http://www.ietf.org/rfc/rfc3325.txt

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