[SR-Users] kamailio sending qop in auth header

It may be my lack of understanding, but I moved from using auth_check function to www_authenticate function and now see kamailio sending qop in auth header. It's my understanding this is not necessary (based on UA types in use) so I would like to remove it. Per module doc, it is "" by default, I tried adding auth param as below but made no difference. What could be causing this? U x.x.x.x:5060 -> y.y.y.y:5060 REGISTER sip:y.y.y.y SIP/2.0. Via: SIP/2.0/UDP x.x.x.x:5060;branch=z9hG4bK-bd3965f2. From: user <sip:user@y.y.y.y>;tag=682bdce181bb953eo0. To: user <sip:user@y.y.y.y>. Call-ID: 1b886b6c-b283de31(a)x.x.x.x. CSeq: 612 REGISTER. Max-Forwards: 70. Contact: user <sip:100@x.x.x.x:5060>;expires=1800. User-Agent: agent Content-Length: 0. Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER. Supported: x-sipura, replaces. . U y.y.y.y:5060 -> x.x.x.x:5060 SIP/2.0 401 Unauthorized. Via: SIP/2.0/UDP x.x.x.x:5060;branch=z9hG4bK-bd3965f2;rport=5060. From: user <sip:user@y.y.y.y>;tag=682bdce181bb953eo0. To: user <sip:user@y.y.y.y>;tag=02500e456b34f8655aebe61627730a5a.852c. Call-ID: 1b886b6c-b283de31(a)x.x.x.x. CSeq: 612 REGISTER. WWW-Authenticate: Digest realm="y.y.y.y", nonce="UoV8q1KFe38amcNXXHXmuDU83y1OXg2n", qop="auth". Server: SIP Proxy. Content-Length: 0.. version: kamailio 4.0.3 (i386/linux) 090035 # ----- auth params ----- modparam("auth", "qop", "") # ----- auth_db params ----- #!ifdef WITH_AUTH modparam("auth_db", "db_url", DBURL) modparam("auth_db", "calculate_ha1", yes) modparam("auth_db", "password_column", "password") modparam("auth_db", "load_credentials", "id") modparam("auth_db", "use_domain", MULTIDOMAIN) modparam("auth_db", "version_table", 0) ......... if (!www_authenticate("$td", SIP_TABLE)) { www_challenge("$td", "1"); exit; } ......... [cid:image001.gif@01CEE17B.A12FBB50]