There are many possibilities.

One of - use listen names and advertised address with allow_double_rr option.

Once you do that - you'll be able to add 2 rr headers, and kamailio will be able to handle gateway functionality between interfaces via RR/Route headers

On Thu, 28 Sept 2023, 11:53 codenot--- via sr-users, <sr-users@lists.kamailio.org> wrote:

UA1(192.168.0.1) --> kamailio (internal:192.168.0.2 public:1.1.1.1) --> UA2(2.2.2.2)
if in UA1 INVITE, I write KSR.rr.record_route().
so UA2(2.2.2.2) received sip msg (Record-Route: <sip:1.1.1.1:7080>), so Kamailio can received BYE/ACK from UA2.
but，Kamailio can't received BYE/ACK from UA1.

if in UA1 INVITE, i write KSR.rr.record_route_advertised_address("192.168.0.2"), then Kamailio can received BYE/ACK from UA1, but not from UA2.

what can i do, let Kamailio receive BYE/ACK from both sides ？
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