I add a few new log calls to learn what happening inside; disabled debug logging in km_res/db_res files to get reduce log size. Debug level is 3.
The lines from log file:
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [notify.c:1035]: calling myself for rl_node
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [notify.c:1008]: process_list_and_exec runs
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [notify.c:1008]: process_list_and_exec runs
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [notify.c:1064]: calling for entry
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [notify.c:1071]: uri=
sip:dbogovych2@sip.voipobjects.com
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1222]: parsed uri:#012 type=1 user=<dbogovych2>(10)#012 passwd=<>(0)#012 host=<
sip.voipobjects.com>(19)#012 port=<>(0): 0#012 params=<>(0)#012 headers=<>(0)
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1223]: uri flags :
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1226]: value=0
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1229]: uri params:#012 transport=<>, val=<>, proto=0
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1232]: user-param=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1235]: method=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1238]: ttl=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1241]: maddr=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1242]: lr=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1243]: r2=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [socket_info.c:583]: grep_sock_info - checking if host==us: 19==13 && [
sip.voipobjects.com] == [78.47.174.187]
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [subscribe.c:968]: new contact insert to subscription list
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: rls [subscribe.c:979]: send subscriptions via pua
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: pua [send_subscribe.c:55]: pres_uri=
sip:dbogovych2@sip.voipobjects.com - len: 34
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: pua [send_subscribe.c:58]: watcher_uri=
sip:dbogovych1@sip.voipobjects.com - len: 34
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: pua [pua_db.c:1211]: No rows found
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: tm [uac.c:243]: DEBUG:tm:t_uac: next_hop=<
sip:dbogovych2@sip.voipobjects.com>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1222]: parsed uri:#012 type=1 user=<dbogovych2>(10)#012 passwd=<>(0)#012 host=<
sip.voipobjects.com>(19)#012 port=<>(0): 0#012 params=<>(0)#012 headers=<>(0)
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1223]: uri flags :
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1226]: value=0
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1229]: uri params:#012 transport=<>, val=<>, proto=0
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1232]: user-param=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1235]: method=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1238]: ttl=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1241]: maddr=<>, val=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1242]: lr=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [parser/parse_uri.c:1243]: r2=<>
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [dns_cache.c:569]: dns_hash_find(_sip._
udp.sip.voipobjects.com(29), 33), h=893
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [resolve.c:727]: get_record: lookup(_sip._
udp.sip.voipobjects.com, 33) failed
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [dns_cache.c:897]: dns_cache_mk_bad_entry(_sip._
udp.sip.voipobjects.com, 33, 60, 1)
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [dns_cache.c:830]: dns_cache_add: adding _sip._
udp.sip.voipobjects.com(29) 33 (flags=1) at 893
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [dns_cache.c:569]: dns_hash_find(
sip.voipobjects.com(19), 1), h=229
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [resolve.c:924]: get_record: skipping 0 NS (p=0x823f515, end=0x823f515)
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [resolve.c:940]: get_record: parsing 0 ARs (p=0x823f515, end=0x823f515)
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [dns_cache.c:1779]: dns_get_related(0xb3158040 (
sip.voipobjects.com, 1), 1, *(nil)) (0)
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: DEBUG: <core> [dns_cache.c:872]: dns_cache_add: adding
sip.voipobjects.com(19) 1 (flags=0) at 229
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: ERROR: tm [ut.h:333]: no corresponding socket for af 2
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: ERROR: tm [uac.c:266]: t_uac: no socket found
Dec 24 13:11:28 vps /usr/local/sbin/kamailio[32231]: ERROR: pua [send_subscribe.c:1044]: while sending request with t_request
Remote peer (dbogovych2) can be registered or not - it does not matter. I see these 3 lines every time.