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@lists.kamailio.org on behalf of Sebastian Damm damm@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@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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