Hello. We use 2 kamailio behind load balanser that have domain name of our system .

uac settings like this:

modparam("uac","restore_mode","none")

modparam("uac","reg_db_url", DBURL)

modparam("uac", "reg_db_table", "uacreg")

modparam("uac", "reg_timer_interval", 20)

modparam("uac", "reg_retry_interval", 10)

modparam("uac", "reg_contact_addr", "sip.service.com:5068")

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

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

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

We have a trouble with registering trunks at porvider. When UAC try to register trunk We see fails like this:

tm [ut.h:272]: uri2dst2(): ERROR: uri2dst: bad_uri: sip.service.com

ERROR: tm [uac.c:266]: t_uac_prepare(): t_uac: no socket found

ERROR: uac [uac_reg.c:746]: uac_reg_update(): failed to send request for [TRUNKNAME]

What we try:

advertised_address=sip.service.com

alias=sip.service.com

alias=kam2.service.com

alias=Kam1.extern.ip.addr

alias=Kam2.extern.ip.addr

alias=load.balanser.ext.ipaddr

These settings not resolved our issue.

We have another trouble and think that it depended issues:

We can call to external numbers through trunks, but call very slow. (10-15 seconds), and some operators (LIKE AT&T dropped our calls to voicemail systems and somethink like that)

Our question is how to successfully register providers at UAC with this scheme. thanks for advices.