[SR-Users] problem with create and release tcp connections

Hi all, Someone know if the kamailio 1.5.0 has problem to create and release tcp connetctions after some time running? In my SIP network I have six IP telephones and one gateway registered over TLS, after some time (one day) this devices have problems to register and make calls. I noticed through the log a freezing of kamailio when it try release the tcp connections. Below is part of the log where I notice this behavior: *Dec 28 09:46:46 vts74 /home2/local/kamailio/sbin/kamailio[8951]: DBG:core:io_watch_add: io_watch_add(0x816cc80, 25, 2, 0xb61e6558), fd_no=20 Dec 28 09:46:46 vts74 /home2/local/kamailio/sbin/kamailio[8951]: DBG:core:handle_tcp_child: cmd CONN_RELEASE 0xb61e6558 refcnt= 0 Dec 28 09:47:11 vts74 /home2/local/kamailio/sbin/kamailio[8940]: DBG:usrloc:nodb_timer: Binding '2503','sips:2503@192.168.174.178;transport=tls' has expired Dec 28 09:47:26 vts74 /home2/local/kamailio/sbin/kamailio[8951]: DBG:core:handle_tcpconn_ev: data available on 0xb621d710 30 Dec 28 09:47:26 vts74 /home2/local/kamailio/sbin/kamailio[8951]: DBG:core:io_watch_del: io_watch_del (0x816cc80, 30, -1, 0x0) fd_no=21 called * I know that upgrade to kamailio 3xx is recommended and I'm working to do it, but before, I have to understand this behavior. Cheers