Hello, it should sync the existing records on startup, in fact it even logs some messages related to that. Maybe just give a more recent version a try, e.g. one of the later 5.5.x releases. Cheers, Henning -- Henning Westerholt – https://skalatan.de/blog/ Kamailio services – https://gilawa.com *From:* sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; *On Behalf Of *Benedito Marques *Sent:* Thursday, July 21, 2022 8:37 PM *To:* Kamailio (SER) - Users Mailing List &lt;sr-users(a)lists.kamailio.org&gt; *Subject:* [SR-Users] Cannot load usrloc table at startup using DMQ_USRLOC sync feature I have an scenario with two kamailios, and no databases. At the first, I authenticate one subscriber successfully and save in memory usrloc: /etc/kamailio # kamailio --version version: kamailio 5.4.4 (x86_64/linux) flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. id: unknown compiled on 16:13:18 Feb 15 2021 with gcc 9.3.0 /etc/kamailio # /etc/kamailio # --- /etc/kamailio # cat /etc/os-release NAME="Alpine Linux" ID=alpine VERSION_ID=3.12.3 PRETTY_NAME="Alpine Linux v3.12" HOME_URL="https://alpinelinux.org/" BUG_REPORT_URL="https://bugs.alpinelinux.org/" --- # Handle SIP registrations route[REGISTRAR] { if (!is_method("REGISTER")) return; if (!save("location","0x05")) { sl_reply_error(); } exit; } -- /etc/kamailio # kamcmd ul.dump { Domains: { Domain: { Domain: location Size: 1024 AoRs: { Info: { AoR: 1014(a)my.domain HashID: -1989102610 Contacts: { Contact: { Address: sip:1014@10.0.0.2:7071;ob Expires: 299 Q: -1.000000 Call-ID: d5cf6d5f293647a59ba64ba996a793b0 CSeq: 43689 User-Agent: MicroSIP/3.20.7 Received: sip: 10.0.0.2:7071 Path: [not set] State: CS_NEW Flags: 1 CFlags: 0 Socket: [not set] Methods: 8159 Ruid: uloc-62d95ca2-3c-1 Instance: [not set] Reg-Id: 0 Server-Id: 0 Tcpconn-Id: -1 Keepalive: 0 Last-Keepalive: 1658412252 KA-Roundtrip: 0 Last-Modified: 1658412252 } } } } Stats: { Records: 1 Max-Slots: 1 } } } } /etc/kamailio # *The problem is*: when I start the second kamailio server, the current usrloc users are not replicated to it, so in the second server the usrloc is empty: /etc/kamailio # kamcmd ul.dump { Domains: { Domain: { Domain: location Size: 1024 AoRs: { } Stats: { Records: 0 Max-Slots: 0 } } } } *The modules loaded:* - dmq.so - dmq_usrloc.so *Params (sync enabled):* modparam("dmq_usrloc", "enable", 1) modparam("dmq_usrloc", "sync", 1) modparam("dmq_usrloc", "usrloc_domain", "location") modparam("dmq_usrloc", "usrloc_delete", 1) modparam("dmq_usrloc", "replicate_socket_info", 0) *Obs*: The DMQ replication is working perfectly. So, if I register another user in server 1, server 2 receives the KDMQ message and the new user appears on usrloc. The real problem is to load pre registered users at startup. *Log messages from second server at startup:* 0(51) DEBUG: <core> [core/sr_module.c:873]: init_mod(): dmq_usrloc 0(51) INFO: dmq_usrloc [dmq_usrloc.c:81]: mod_init(): dmq usrloc replication mode = 1 0(51) DEBUG: <core> [core/sr_module.c:652]: find_mod_export_record(): found export of <ul_bind_usrloc> in module usrloc [/usr/lib/kamailio/modules/usrloc.so] 0(51) DEBUG: <core> [core/sr_module.c:652]: find_mod_export_record(): found export of <bind_dmq> in module dmq [/usr/lib/kamailio/modules/dmq.so] 0(51) DEBUG: dmq_usrloc [usrloc_sync.c:286]: usrloc_dmq_initialize(): loaded dmq api 0(51) DEBUG: dmq_usrloc [usrloc_sync.c:299]: usrloc_dmq_initialize(): dmq peer registered 0(51) DEBUG: dmq_usrloc [dmq_usrloc.c:111]: mod_init(): dmq_usrloc initialized 0(51) DEBUG: <core> [core/sr_module.c:804]: init_mod_child(): idx 0 rank -127: dmq_usrloc [main] 0(51) DEBUG: dmq_usrloc [dmq_usrloc.c:127]: child_init(): child_init PROC_INIT 7(62) DEBUG: dmq_usrloc [usrloc_sync.c:552]: usrloc_dmq_request_sync(): requesting sync from dmq peers 0(51) DEBUG: <core> [core/sr_module.c:804]: init_mod_child(): idx 0 rank 0: dialog [main] 7(62) DEBUG: dmq_usrloc [usrloc_sync.c:568]: usrloc_dmq_request_sync(): sending serialized data {"action":3} 7(62) DEBUG: dmq_usrloc [usrloc_sync.c:317]: usrloc_dmq_send(): sending dmq broadcast... 7(62) DEBUG: dmq [dmq_funcs.c:166]: bcast_dmq_message1(): skipping node sip:10.0.2.38:5090 7(62) DEBUG: dmq [dmq_funcs.c:166]: bcast_dmq_message1(): skipping node sip:10.0.2.30:5090 7(62) DEBUG: dmq [dmq_funcs.c:166]: bcast_dmq_message1(): skipping node sip:0.0.0.0:5090 *List nodes at SERVER 1:* /etc/kamailio # kamcmd dmq.list_nodes { host: 10.0.1.36 port: 5090 resolved_ip: 10.0.1.36 status: active last_notification: 0 local: 0 } { host: 10.0.1.35 port: 5090 resolved_ip: 10.0.1.35 status: active last_notification: 0 local: 0 } { host: 0.0.0.0 port: 5090 resolved_ip: 0.0.0.0 status: active last_notification: 0 local: 1 } *List nodes at SERVER 2:* /etc/kamailio # kamcmd dmq.list_nodes { host: 10.0.1.35 port: 5090 resolved_ip: 10.0.1.35 status: active last_notification: 0 local: 0 } { host: 10.0.1.36 port: 5090 resolved_ip: 10.0.1.36 status: active last_notification: 0 local: 0 } { host: 0.0.0.0 port: 5090 resolved_ip: 0.0.0.0 status: active last_notification: 0 local: 1 } -- Att, Benedito Marques