<p></p>
<h3>Description</h3>
<p>In my environment, I use AAAA dns names without A dns records.<br>
When kamailio start, using <code>tcpdump</code> I can see only A request and does not see AAAA.<br>
In config file configred</p>
<pre><code>dns_cache_flags = 4
</code></pre>
<h3>Troubleshooting</h3>
<h4>Reproduction</h4>
<p>Configure  kamailio to use rtpengine servers AAAA dns names. A dns records os not exists.</p>
<h4>Debugging Data</h4>
<p>None</p>
<h4>Log Messages</h4>
<p>None</p>
<h4>SIP Traffic</h4>
<p>None</p>
<h3>Possible Solutions</h3>
<p>I do now know</p>
<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>[root@ip-172-23-6-136 ~]# kamailio -v
version: kamailio 5.5.0-dev1 (x86_64/linux) d9dd2a
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: d9dd2a 
compiled on 04:01:13 Aug 22 2020 with gcc 8.3.1
</code></pre>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>
<pre><code>[root@ip-172-23-6-136 ~]# cat /etc/os-release 
NAME="CentOS Linux"
VERSION="8 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="8"
PLATFORM_ID="platform:el8"
PRETTY_NAME="CentOS Linux 8 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:8"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-8"
CENTOS_MANTISBT_PROJECT_VERSION="8"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="8"
</code></pre>

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