<p></p>
<h3>Description</h3>
<p><a href="https://tools.ietf.org/html/rfc5952#section-4.3" rel="nofollow">rfc5952#section-4.3</a></p>
<blockquote>
<p><strong>4.3.  Lowercase</strong><br>
The characters "a", "b", "c", "d", "e", and "f" in an IPv6 address<br>
MUST be represented in lowercase.</p>
</blockquote>
<h3>Expected behavior</h3>
<p>According to RFC</p>
<h4>Actual observed behavior</h4>
<p>IPv6 addresses the upper case.</p>
<h4>Debugging Data</h4>
<p>None</p>
<h4>Log Messages</h4>
<p>None</p>
<h4>SIP Traffic</h4>
<pre><code>OPTIONS sip:proxy.example.com;transport=tcp SIP/2.0
Via: SIP/2.0/TCP [2600:1F1C:257:8706:C6BA:A565:1E85:B29E];branch=z9hG4bKa3e9.cac3f2f1000000000000000000000000.0
To: <sip:proxy.example.com;transport=tcp>
From: <sip:proxy@example.com>;tag=897804205b5fb4c6a22d7dcb9cb796fb-733ff025
CSeq: 10 OPTIONS
Call-ID: 29ea7b443fbf87f8-2892@172.22.6.119
Max-Forwards: 70
Content-Length: 0
User-Agent: Kamailio
</code></pre>
<h3>Possible Solutions</h3>
<p>Not known</p>
<h3>Additional Information</h3>
<ul>
<li><strong>Kamailio Version</strong> - output of <code>kamailio -v</code></li>
</ul>
<pre><code>[centos@ip-172-22-6-226 ~]$ kamailio -v
version: kamailio 5.5.0-dev2 (x86_64/linux) 60f04b
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: 60f04b 
compiled on 04:01:18 Sep 26 2020 with gcc 8.3.1
</code></pre>
<ul>
<li><strong>Operating System</strong>:</li>
</ul>
<pre><code>[centos@ip-172-22-6-226 ~]$ 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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