According to RFC 3310 paragraph 2 it states that "Using the shared secret K and the sequence number SQN, the client verifies the AUTN with the ISIM." According to TS 33.102 : AUTN := SQN Å AK || AMF || MAC. SQN is saved in the ISIM and the AK is calculated from K (saved in the ISIM) and RAND (from the nonce header). Where does the client get the AMF value in order to calculate the MAC and the AUTN for server authentication? Michel Eilat High End MGWs SIP technologies manager R&D Application Group AudioCodes www.audiocodes.com <http://www.audiocodes.com/> Tel: +972-3-9764160 Fax: +972-3-9764040 Mobile: +972-54-4433168 _______________________________________________ Sip-implementors mailing list [email protected] http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
