Can kamailio enforce client to REGISTER with AKAv1?

Here our setup: 1. kamailio version 4.3.4 for IMS 2. Boghe IMS client v1.0.58.550 3. scscf.cfg is configure with: #!define REG_AUTH_DEFAULT_ALG "AKAv1-MD5"

a. First REGISTER fails with 401 Unauthorized b. Second REGISTER 200 OK, but the REGISTER is MD5 and not AKAv1 Authorization: Digest username="bob@net1.test", realm="net1.test", nonce="XdzPaF3czjz0oMKPeNLScpKAfb9prE7x", uri="sip:net1.test", response="854d9c2f3fe3dd3c96c14f8a2d20c2f9", algorithm=MD5

Thank you,