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[reSIProcate] about the REGISTER


Dear all,
 
If i understood the REGISTER will like that:
 
AU                            SERVER
         REGISTER 
1) --------------------------------->
         401 unauthorized
2) <---------------------------------
 
        REGISTER      
3) --------------------------------->
        100 trying
4) <--------------------------------
        OK
5) <--------------------------------
 
When testing,the program only send 1).
How can i check that it will received the 401 unauthorized?