IPv6 bind wrong IP. #4199

*Dear Sir,*

I have opened an issue on GitHub: *"IPv6 bind wrong IP. #4199
<https://github.com/kamailio/kamailio/issues/4199>"*.

*System Details:*

   -

   *Kamailio (5.8.x)* – SIP Proxy
   -

   *FreeSWITCH* – Media Server
   -

   *OS* – Debian 12
   -

   *Gateway* – aaaa:bbb:cccc:20::1
   -

   *IPv6 Address* – aaaa:bbb:cccc:20::41e

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*kamailio.cfg:*

#!define ADDR_IPV4 xxx.xxx.xxx.xxx
#!define ADDR_IPV6 [aaaa:bbb:cccc:20::41e]

listen=ADDR_IPV4
listen=ADDR_IPV6

------------------------------

*netstat Output:*

tcp6  0  0  aaaa:bbb:cccc:20:::5060  :::*  LISTEN  1691274/kamailio
tcp6  0  0  aaaa:bbb:cccc:20:::5061  :::*  LISTEN  1691274/kamailio
udp6  0  0  aaaa:bbb:cccc:20:::5060  :::*          1691222/kamailio

As shown, although I explicitly set the listen IP to aaaa:bbb:cccc:20::41e,
Kamailio strips the last part of the address and binds to aaaa:bbb:cccc:20::

I also upgraded to *version 6.0* with default cfg and set auto_bind_ipv6=1
or changed ipv6 address, but the issue still persists.
------------------------------

*IPv6 Interface Configuration:*

auto eth1
iface eth1 inet6 static
    address aaaa:bbb:cccc:20::41e
    netmask 64
    gateway aaaa:bbb:cccc:20::1

I can successfully ping in and out using this IPv6 address.
------------------------------

Do I need to configure anything else in Kamailio or the system to ensure it
binds to the full IPv6 address aaaa:bbb:cccc:20::41e as expected?

Currently I can register with ipv4, but ipv6 does not.

Thank you for your assistance.

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