Hi All,
        I am implementing AKA (Authentication and Key
agreement for SIP 
client. I was going through 3GPP TS 33.102 V4.4.0. It
is mentioned in
this 
document that SIP client calculates MAC and RES using
f1 and f2. where
f1 
and f2 are message authentication functions for
calculating MAC and RES.
I 
tried to find what these functions are. So far I did
not find any 
information on it.

        Please help me and let me know what are these
functions.


Thanks in advance.
Krsna


 
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