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

[Samuel F.]

Thank you for the responses! As a follow up question, how do companies with large loads on their Kamailios handle restarts especially considering the CANCELs?

What is a good (business) process to restart a Kamailio without incurring any interruptions at all? What other components in the infrastructure would be in place and which ones are in use in the wild?


// Samuel

________________________________
From: sr-users <sr-users-bounces at lists.kamailio.org> on behalf of Sebastian Damm <damm at sipgate.de>
Sent: Thursday, July 13, 2017 2:39:39 PM
To: Kamailio (SER) - Users Mailing List
Subject: Re: [SR-Users] What happens to calls when Kamailio restarts?

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

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