[SR-Users] IPv6 socket issues

[Kees Meijs - SIGNET B.V.]

Good evening,

During pre-production testing, we discovered quite odd IPv6 socket 
issues. Problems arise when a SIP dialog is initiated from within 
Kamailio (e.g. a SIP INVITE message).

Using ngrep, it seems very odd IPv6 sockets are opened, for example:

> U 2001:beef:34a:10::234:5060 -> 2001:beef:285:1::3:5060 1573541542 at 0:1440
> U 2001:beef:34a:10::234 -> 2001:beef:285:1::3 +1573541542 at 1448:17

Obviously the "1573541542 at 0:1440" part is bogus, I expect output similar to:

> U 2001:beef:34a:10::234:5060 -> 2001:beef:285:1::3:5060
> INVITE sip:s@[2001:beef:285:1::3]:5060 SIP/2.0.

When I do a REGISTER from UA using IPv6, the dialog (and return packets) 
seem completely normal.

Using IPv4, there's no problem at all.

It seems the socket problems are triggered when:

 1. Using the topoh module.
 2. When altering From: headers e.g. using uac_replace_from().

When topoh is disabled and no headers are altered, IPv6 works as good as 
IPv4.

We could reproduce the problem using Kamailio 4.1.4, 4.1.5 and 4.2.0 on 
Debian (64-bit).

Please advice what to do.

Thanks in advance!

Best regards,
Kees

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