[SR-Users] dispatcher & failover

Hello I am working with Kamailio 5.0 dispatcher module. I am aiming at having two or more gateways receiving the traffic with load balancing, and when one fails, that the traffic is distributed among others. Currently, testing with 2 gw. I see the options message going out (and not being answered). When I monitor with kamctl dispatcher dump, I never see the faulty gw going inactive (flags remain AP), and calls are still tried to the faulty gw. "Best" result so far is with ds_probing_mode=1, the flags start at AX with both gateway up, then AP once they've replied to an OPTIONS, and even if I stop one, and OPTIONS is no longer replied, it stays at AP. when a call comes through, it is tried on this GW (3 invites), and then fails onto the other one. I was expecting that the gw would not be tried if inactive. Am I missing something ? J. modparam("dispatcher", "db_url", DBURL) modparam("dispatcher", "table_name", "dispatcher") modparam("dispatcher", "flags", 2) modparam("dispatcher", "dst_avp", "$avp(AVP_DST)") modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)") modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)") modparam("dispatcher", "sock_avp", "$avp(AVP_SOCK)") modparam("dispatcher", "ds_ping_method", "OPTIONS") modparam("dispatcher", "ds_ping_from", "sip:probe@probe") modparam("dispatcher", "ds_ping_reply_codes", "class=2;class=3;class=4;class=5") modparam("dispatcher", "ds_ping_interval", 30) modparam("dispatcher", "ds_probing_mode", 1) modparam("dispatcher", "ds_probing_threshold", 3) modparam("dispatcher", "ds_timer_mode", 1)