the same thing happens with TLS connections.
one side effect is that the subscription doesn't get updated to active and gets cleaned by timer proc.
Dec 20 18:20:32 kamailio-05 kamailio[6089]: INFO: <script>: received dialog update for sip:2134@sip.com Dec 20 18:20:32 kamailio-05 kamailio[6089]: CRITICAL: <core> [pass_fd.c:157]: send_all(): send on 0 failed: Socket operation on non-socket Dec 20 18:20:32 kamailio-05 kamailio[6089]: ERROR: <core> [tcp_main.c:2303]: tcpconn_send_put(): failed to get fd(write):Socket operation on non-socket (88) Dec 20 18:20:32 kamailio-05 kamailio[6089]: ERROR: tm [../../forward.h:247]: msg_send(): tcp_send failed Dec 20 18:20:32 kamailio-05 kamailio[6089]: ERROR: tm [uac.c:598]: send_prepared_request_impl(): t_uac: Attempt to send to precreated request failed Dec 20 18:20:32 kamailio-05 kamailio[6089]: INFO: presence [notify.c:1604]: send_notify_request(): NOTIFY sip:user_7z7b6s@sip.com via sip:user_7z7b6s@192.168.16.12:15778;transport=tls on behalf of sip:2134@sip.com for event dialog
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