Hello. I have construction Asterisk --> Kamailio --> Providers

My provisers registered with UAC modure and stored at UACREG table.

Problem scenario is:

I ring from asterisk to provider

Asterisk --> Kamailio --> Providers

Call from asterisk come to kamailio with

furi(Asterisk_clinet_local_number@asterisk)

turi(external_number@kamailio)

Then, to forward INVITE to provider that Needed I use some manipulations to choose provider (it does not matter, it is only sql_queryes to some tables), and then modify invite with this code:

#$var(prov) - my.provider.ip

#$var(trunk) - name_of_trunk

uac_replace_from("sip:$var(trunk)@$var(prov)");

$rd=$var(prov);

$rp="5060";

$td=$var(prov);

remove_hf("Contact");

append_hf("Contact:<$var(trunk)@my.kamailio.domain:5068>\n","Contact");
#Then I get from database varibles to set it at failure route whet it needs to auth

#modparam("uac","auth_realm_avp","$avp(s:realm)")

#modparam("uac","auth_username_avp","avp(s:uname)")

#modparam("uac","auth_password_avp","$avp(s:passwd))")

sql_pvquery("ca","select auth_username, auth_password, realm from uacreg where auth_username='$var(trunk)'","$avp(uname), $avp(passwd), $avp(realm)");

So -after this manipulation I have write packet, that goes to my provider.

Then Provier sends me 407 answer and packet goes to failure_route

if (t_check_status("401|407")){

xlog("L_INFO", "Reply from provider on failure: $rs");

pv_printf("$avp(s:uname)","$var(uname)");

pv_printf("$avp(s:passwd)","$var(passwd)");

pv_printf("$avp(s:realm)","$var(realm)");
avp_print();

uac_auth();

xlog("L_INFO", "UAC_AUTH(): $rs");

t_relay();

}

After that Call fails. When I look at at syslog I see that avp parametrs succesfull sets: INFO: avpops [avpops_impl.c:1484]: ops_print_avp(): p=0x7f63acec0650, flags=0x0113 INFO: avpops [avpops_impl.c:1488]: ops_print_avp(): #011#011#011name=<realm> INFO: avpops [avpops_impl.c:1496]: ops_print_avp(): #011#011#011val_str=<0 / 1> INFO: avpops [avpops_impl.c:1484]: ops_print_avp(): p=0x7f63acebe1a8, flags=0x0113 INFO: avpops [avpops_impl.c:1488]: ops_print_avp(): #011#011#011name=<passwd> INFO: avpops [avpops_impl.c:1496]: ops_print_avp(): #011#011#011val_str=<0 / 1> INFO: avpops [avpops_impl.c:1484]: ops_print_avp(): p=0x7f63ace697a8, flags=0x0113 INFO: avpops [avpops_impl.c:1488]: ops_print_avp(): #011#011#011name=<uname> INFO: avpops [avpops_impl.c:1496]: ops_print_avp(): #011#011#011val_str=<0 / 1> INFO: avpops [avpops_impl.c:1484]: ops_print_avp(): p=0x7f63acec0240, flags=0x0113 INFO: avpops [avpops_impl.c:1488]: ops_print_avp(): #011#011#011name=<realm> INFO: avpops [avpops_impl.c:1496]: ops_print_avp(): #011#011#011val_str=<my.provider.com / 15> INFO: avpops [avpops_impl.c:1484]: ops_print_avp(): p=0x7f63acec0308, flags=0x0113 INFO: avpops [avpops_impl.c:1488]: ops_print_avp(): #011#011#011name=<passwd> INFO: avpops [avpops_impl.c:1496]: ops_print_avp(): #011#011#011val_str=<mYPa$$wd / 8> INFO: avpops [avpops_impl.c:1484]: ops_print_avp(): p=0x7f63acea3d40, flags=0x0113 INFO: avpops [avpops_impl.c:1488]: ops_print_avp(): #011#011#011name=<uname> INFO: avpops [avpops_impl.c:1496]: ops_print_avp(): #011#011#011val_str=<myTrunk/ 16>
But Next I see:

ERROR <script> : AUTH_UAC(): <null>

As I see AUTH_UAC() don`t want to set Auth parameters.

My question is Why?

Thanks!