When an INVITE comes in, we instruct Kamailio to query a http service to know 
which clients should receive the INVITE message. If multiple of these 
"receiver"-clients are running on the same machine (same IP address, but 
different source port), we see that Kamailio forwards multiple INVITE to one 
single client (although the clients are listening on different ports!). The 
problem happens (strangely) only when we run Kamailio in AWS (Fargate) behind a 
load balancer, we have not observed the issue by using vanilla docker 
containers.

I am not 100% sure the code in this PR is indeed fixing the issue at the right 
place but with the patch above everything works fine. 
The above estimation of ~10h is an estimation error on our side, the issue is 
always reproducible.

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