[SR-Users] websocket devices keepalive not working

I try to send keepalive requests (options) to clients at usrloc I tried 4 mechanisms 1) nathelper modparam("nathelper", "sipping_method", "OPTIONS") modparam("nathelper", "natping_interval", 15) modparam("nathelper", "ping_nated_only", 0) modparam("nathelper", "sipping_bflag", 7) modparam("nathelper", "sipping_from", "sip:pinger@mydomain") but it didn't send keepalives to noone client 2)nat_traversal I tried to trigger keepalives with nat_keepalive() when REGISTER coming to my service It works fine with UDP packets modparam("nat_traversal", "keepalive_interval", 15) modparam("nat_traversal", "keepalive_method", "OPTIONS") modparam("nat_traversal", "keepalive_from", "sip:pinger@mydomain") modparam("nat_traversal", "keepalive_state_file", "/var/run/keepalive_state") 3)So I also tried to do it with WebSocket keepalive mechanism, but it still not work for (off course I checked only WS devices) modparam("websocket", "keepalive_mechanism", 15) modparam("websocket", "keepalive_timeout", 15) modparam("websocket", "keepalive_interval", 15) 4) I tried to do it with tcpops Only for ws and tcp (WS is use TCP as i know) tcp_keepalive_enable("15", "5", "15"); same result... So I need mechanism to check all devices for keepalive. I think nathelper works with all protos (As I read at docs) Can somebody explain to me what I doing wrong?