I see here scenario that probably will help you:

You can use asterisk real time db to share address of record between nodes. In that case any asterisk will be able to know Where to send request if some one calls to client.
I coming registration you will need to route based on your dispatcher list on kamailio. So if one of asterisk will fail down - you it will Redirect Register request automatically

On Tue, 3 Mar 2020, 06:38 Sharad Kumar, <voip.security@protonmail.com> wrote:
Hey guys, 

I am implementing one scenario where I want the help of very smart people. 
So let’s say one UAC 999 registers to Asterisk 1 server via kamailio and asterisk 1 server goes down. Is there any way I can move that registration to another asterisk server or is there any way I can force UAC to re register so that I can route the new Register to the available asterisk ? 

Any help will be really appreciated. 

Thank you 
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