[SR-Users] Call Preservation Mode in Kamailio

Alex Balashov abalashov at evaristesys.com
Sun Jan 9 17:37:43 CET 2022

A question I would carefully consider is:

What exactly needs to be “preserved”? 

To be sure, there are some valid answers to that question: transaction state for handling CANCELs or pending requests, in-dialog variables, etc.

Still, you can kill a Kamailio instance ‘mid-call’ - or even disconnect the proxy server from the network - without interrupting the call… 

— Alex

> On Jan 9, 2022, at 5:48 AM, varun pratapsingh <varunps2003 at gmail.com> wrote:
> Happy New Year 2022 Everyone. Wish you a lot of innovation this year!
> I was just curious to know if any of us had handled the mid-call failures using the Kamailio. I am writing a SIP Client to handle the failures by using the DNS SRV based failover and Fallback approach where I am using two Kamailio instances as Outbound Proxy resolved by DNS SRV lookup. Everything is fine except for on-going calls. How to handle the mid-call failovers? Is there any way in Kamailio like Call Preservation mode or something? 
> Any suggestions or ideas to handle midcall failover so that if a current Outbound Proxy goes down then all the ongoing calls can be seamlessly routed through another Kamailio (secondary).
> Thanks and Regards
> Varun
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Alex Balashov | Principal | Evariste Systems LLC

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