Hi I made some changes on testserver.c. Then I call a sipnumber from the flex client to a x-lite client. When I hang up from the flex side, can receive CHANNEL_HANGUP_COMPLETE event loop can be ended. When I hang up from the x-lite side, I can't receive CHANNEL_HANGUP_COMPLETE event and loop can not be ended, the variable status value is ESL_BREAK. Thanks. Code is as follows static void mycallback(esl_socket_t server_sock, esl_socket_t client_sock, struct sockaddr_in *addr) { esl_handle_t handle = {{0}}; int done = 0; esl_status_t status; time_t exp = 0; esl_attach_handle(&handle, client_sock, addr); esl_log(ESL_LOG_INFO, "Connected! %d\n", handle.sock); esl_filter(&handle, "unique-id", esl_event_get_header(handle.info_event, "caller-unique-id")); esl_events(&handle, ESL_EVENT_TYPE_PLAIN, "CHANNEL_HANGUP_COMPLETE DTMF CUSTOM"); esl_send_recv(&handle, "linger"); esl_execute(&handle, "set", "hangup_after_bridge=true", NULL); esl_execute(&handle, "bridge", "user/1001@192.168.1.128", NULL); int i=rand(); while((status = esl_recv_timed(&handle, 1000)) != ESL_FAIL) { printf("Thread:%d\n", i); if (done) { if (time(NULL) >= exp) { break; } } else if (status == ESL_SUCCESS) { const char *type = esl_event_get_header(handle.last_event, "content-type"); if (type && !strcasecmp(type, "text/disconnect-notice")) { const char *dispo = esl_event_get_header(handle.last_event, "content-disposition"); esl_log(ESL_LOG_INFO, "Got a disconnection notice dispostion: [%s]\n", dispo ? dispo : ""); if (dispo && !strcmp(dispo, "linger")) { done = 1; esl_log(ESL_LOG_INFO, "Waiting 5 seconds for any remaining events.\n"); exp = time(NULL) + 5; } } } } esl_log(ESL_LOG_INFO, "Disconnected! %d\n", handle.sock); esl_disconnect(&handle); }