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@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@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;

}

………