I'm doing stress testing against kamailio (sip load balancer role) sending sip registrar, my stress test software is sending 50 registrations per second, after 30 seconds and 1000 registers processed the function ds_select_dst (I'm using algorithm 4) returns null for all registers sent from my software, and all registrar sip servers are available and in active mode, if I reduce the software to  send 20 registrar's per second, the issue only happens after 60 seconds and kamailio (sip load balancer role)  process 4000 registrers, after this, function ds_select_dst starts returning null

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