Asterisk uses OPTIONS messages to qualify a peer's availability.

Make sure Kamailio handles these properly, like for e.g.:

if(is_method("OPTIONS") && uri==myself && $rU==$null)
options_reply();

There could be many other reasons, so dump SIP traffic, search for these OPTIONS and see if they are replied properly.

Cheers.

On Mon, Aug 19, 2019 at 1:32 PM Zhan Bazarov <chiefkeeft@gmail.com> wrote:

Hello, we have interesting issue...
Some time kamailio comes unreachable on private interface for asterisk, but port checked via telnet and everything is ok...
ps. connection via public ip works good

root@kamailio:/usr/local/etc/kamailio# lsof -i :5068 | grep LISTEN
kamailio 6014 root 13u IPv4 8341589 0t0 TCP kamailio.local.ip:5068 (LISTEN)
kamailio 6014 root 14u IPv4 8341590 0t0 TCP kamailio.public.ip:5068 (LISTEN)
root@kamailio:/usr/local/etc/kamailio#

telnet from asterisk machine:

root@asterisk:/etc/asterisk# telnet kamailio.local.ip 5068

Trying kamailio.local.ip...

Connected to kamailio.local.ip.

Escape character is '^]'.

But peer is unreachable in asterisk... More than, kamailio comes reachable when I change transport from TCP to UDP, or when I restart kamailio daemon(but it situation repeats every day)..

Any ideas how I can fix it?
thanks!
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