If you want to proxy registrations with multiple kamailio, you could use dispatcher with setid (eventually combining with dialplan for regex matching) and set outbound proxy on asterisk / free switch .
For nat handing , kamailio needs to handle correctly the contact if private ip is presented, before relaying to asterisk/fs. 
Take a look  at default config , route NATMANAGE.



Il giorno lun 2 gen 2023 alle 15:57 nutxase <nutxase@proton.me> ha scritto:
Hi Guys,

can someone point me in the right direction as to how i can use kamailio as a registration proxy similar to how opensips does mid_registrar?

i want to proxy all sip registrations through kamailio to asterisk or freeswitch



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