Hi Oleg, Yes the S-CSCF implementaiton of AKAv1-MD5 works with an actual SIM card for a first registration. For Re-registration I am not 100% sure it works because it receives a previous nonce and the response is calculated over the new message, apparently there is a configuration parameter max_nonce_reuse which is relevant in this case. Also the resynchronization I haven't tested with a real SIM card. Best regards alberto El 14/10/2022 a las 13:52, Oleg Belousov escribió: Hello, I'm wondering if ims_auth is tested with actual SIM-card/AKAv1-MD5 authentication? Bit concerned with that since as per authorize.c source code can see for AUTH_AKAV1_MD5/AUTH_AKAV2_MD5/AUTH_MD5 response is counted in the same way, though algorithms are different. -- obelousov.tel __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussionssr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe:https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users __________________________________________________________ Kamailio - Users Mailing List - Non Commercial Discussions sr-users(a)lists.kamailio.org Important: keep the mailing list in the recipients, do not reply only to the sender! Edit mailing list options or unsubscribe: https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users