Description

rfc5952#section-4.3

4.3. Lowercase
The characters "a", "b", "c", "d", "e", and "f" in an IPv6 address
MUST be represented in lowercase.

Expected behavior

According to RFC

Actual observed behavior

IPv6 addresses the upper case.

Debugging Data

None

Log Messages

None

SIP Traffic

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

Possible Solutions

Not known

Additional Information

[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

[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"

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