<h3>Description</h3>
<p>Hello,</p>
<p>related to <a href="https://github.com/kamailio/kamailio/issues/265" class="issue-link js-issue-link" data-error-text="Failed to load issue title" data-id="96987824" data-permission-text="Issue title is private" data-url="https://github.com/kamailio/kamailio/issues/265">#265</a> ,<br>
I can reproduce the issue, with kamailio 4.4.6+jessie from kamailio debian repository</p>
<ul>
<li>0x04 flag is set on save()</li>
<li>old contacts are deleted on the server receiving the REGISTER message</li>
<li>old contacts are not deleted on servers being notified via DMQ</li>
</ul>

<h3>Troubleshooting</h3>
<h4>Reproduction</h4>
<ul>
<li>Setup 2 servers with dmq & dmq_usrloc replication between each other, and with registration on 1st</li>
<li>Use 0x04 flag on save() function</li>
<li>Register your softphones a 1st time  on 1 server: registration is replicated on 2d server, contact is on both servers</li>
<li>Reregister (with different contact) on same server:
<ul>
<li>previous contact is deleted on 1st server</li>
<li>new contact is replicated to 2d server</li>
<li>previous contact is <em>NOT</em> delete on 2d server</li>
</ul>
</li>
</ul>
<h4>Log Messages</h4>
<p>server1 (REGISTER message):</p>
<pre><code>DEBUG: usrloc [ucontact.c:1692]: update_ucontact(): exists callback for type= UL_CONTACT_UPDATE
DEBUG: usrloc [ul_callback.h:84]: run_ul_callbacks(): contact=0x7f0096e0b548, callback type 2/15, id 0 entered
DEBUG: dmq_usrloc [usrloc_sync.c:578]: dmq_ul_cb_contact(): Callback from usrloc with type=2
DEBUG: dmq_usrloc [usrloc_sync.c:548]: usrloc_dmq_send_contact(): sending serialized data {"action":1,"aor":"+33564093848","ruid":"uloc-5a86b8c5-31e0-2","c":"sip:+33564093848@xxx:41502;ob","received":"","path":"","callid":"ntoWjs3R3WpP9Z5rsi7Npmr2rRGKstls","user_agent":"CSipSimple_porridge-23/r2457","instance":"","expires":1518779539,"cseq":55952,"flags":0,"cflags":0,"q":-1,"last_modified":1518778639,"methods":8159,"reg_id":0}
DEBUG: dmq_usrloc [usrloc_sync.c:299]: usrloc_dmq_send(): sending dmq broadcast...
</code></pre>
<p>server2 (DMQ recipient):</p>
<pre><code>DEBUG: dmq_usrloc [usrloc_sync.c:327]: usrloc_dmq_handle_msg(): dmq message received from sip:usrloc@172.16.67.15:5060
DEBUG: dmq_usrloc [usrloc_sync.c:429]: usrloc_dmq_handle_msg(): Received DMQ_UPDATE. Update contact info...
DEBUG: dmq_usrloc [usrloc_sync.c:64]: add_contact(): aor: +33564093848
DEBUG: dmq_usrloc [usrloc_sync.c:65]: add_contact(): ci->ruid: uloc-5a86b8c5-31e0-2
DEBUG: dmq_usrloc [usrloc_sync.c:66]: add_contact(): aorhash: -1799456359
DEBUG: dmq_usrloc [usrloc_sync.c:72]: add_contact(): Found contact
DEBUG: usrloc [ucontact.c:1692]: update_ucontact(): exists callback for type= UL_CONTACT_UPDATE
DEBUG: usrloc [ul_callback.h:84]: run_ul_callbacks(): contact=0x7f3900243bd0, callback type 2/15, id 0 entered
DEBUG: dmq_usrloc [usrloc_sync.c:578]: dmq_ul_cb_contact(): Callback from usrloc with type=2
DEBUG: dmq_usrloc [usrloc_sync.c:600]: dmq_ul_cb_contact(): Contact received from DMQ... skip
DEBUG: usrloc [ucontact.c:1004]: db_update_ucontact_ruid(): ruid:uloc-5a86b8c5-31e0-2
DEBUG: usrloc [ucontact.c:1133]: db_update_ucontact_ruid(): contact:sip:+33564093848@xxx:41502;ob
DEBUG: dmq_usrloc [usrloc_sync.c:74]: add_contact(): Release record
DEBUG: dmq_usrloc [usrloc_sync.c:76]: add_contact(): Unlock udomain
</code></pre>
<p>the recipient receive an UPDATE message only.<br>
according to usrloc_sync.c:usrloc_dmq_handle_msg(), UPDATE message add the new contact only (execute add_contact()), but the other one is not deleted</p>
<p>and there is no DMQ_RM message generated from the emitter</p>
<h3>Possible Solutions</h3>

<h3>Additional Information</h3>
<pre><code>version: kamailio 4.4.6 (x86_64/linux) 
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 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 with gcc 4.9.2
</code></pre>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>
<pre><code>3.16.0-4-amd64 #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26) x86_64 GNU/Linux
</code></pre>

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