HI fellows,

I hope everyone be ok.
I would like someone can help me with the following.

I have been through the web trying looking for the RFC who talks about the 
parameter values of the Authorization header in the SIP Register.

I have the following from one guide that I have, but I would like to read with 
more details the RFC.
I was 2617 and 3261, but there are not the details as I found below in my 
Platform Guide.

The Authorization header
A request with authentication will contain the Authorization header, e.g.

username - the authentication username. 
realm - Must be the same as the realm on the 401 response. 
nonce - The nonce used to generate the response
uri - This is a repetition of the request URI and used to generate the response
response - This is a hash of various parameters including the password (see 
later)
cnonce - A string generated by the client used to generate the response
nc - A count of the number of times the nonce has been used. Used to generate 
the response and prevent replay attacks.
qop - should be "auth"
algorithm - MD5


I really appreciate a lot all your help.
Regards
Guillermo

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