[SR-Users] What happens to calls when Kamailio restarts?

[Sebastian Damm]

Hi,

On Wed, Jul 12, 2017 at 11:53 AM, Alex Balashov
<abalashov at evaristesys.com> wrote:
> All SIP messages passing through the proxy can be forwarded statelessly
> and based on properties of the SIP message alone.

There's one thing that could happen: Calls that get cancelled after a
restart, could possibly keep on ringing on the far end. At least if
you check for an active transaction in your kamailio config.

  if (!t_check_trans()) {
      sl_send_reply("481", "Call/Transaction does not exist");
      xlog("L_ERR", "CANCEL: found no matching transaction F=$fu T=$tu
R=$ru\n");
      return;
  }

And if you do some sort of random dispatching, CANCELs could end up on
a different gateway.

But other than that, a restart shouldn't cause much trouble.
Especially in-call requests get routed by Route headers only.

Regards,
Sebastian