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.
Harish

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