== AsteriskVer0-2-0/CallDetailRecord ==
* pbx.c
 * ast_cdr_start(c->cdr);
  * ast_pbx_run
   * pbx_thread
    * ast_pbx_start
     * ast_async_goto
      * ast_async_goto_by_name
     * ast_pbx_outgoing_exten
   * async_wait
    * ast_pbx_outgoing_exten

* ast_pbx_start
 * chan_alsa.c: alsa_new
 * chan_iax.c: ast_iax_new
 * chan_modem.c: ast_modem_new
 * chan_oss.c: oss_new
 * chan_phone.c: phone_new
 * chan_sip.c: sip_new
 * chan_vofr.c: vofr_new
 * chan_zap.c: zt_new

* ast_pbx_run
 * chan_zap.c: ss_thread, do_idle_thread

* manager.c
 * ast_pbx_outgoing_exten
  * action_originate

 * ast_async_goto_by_name
  * action_redirect
{{{
static struct action {
        char *action;
        int authority;
        int (*func)(struct mansession *s, struct message *m);
} actions[] = {
        { "Ping", 0, action_ping },
        { "Logoff", 0, action_logoff },
        { "Hangup", EVENT_FLAG_CALL, action_hangup },
        { "Status", EVENT_FLAG_CALL, action_status },
        { "Redirect", EVENT_FLAG_CALL, action_redirect },
        { "Originate", EVENT_FLAG_CALL, action_originate },
};
}}}

* process_message
 * session_do
  * accept_thread
   * init_manager
    * reload_manager

* loader.c
 * reload_manager
  * ast_module_reload

* asterisk.c
 * ast_module_reload
  * hup_handler

* cli.c
 * ast_module_reload
  * handle_reload
{{{
static struct ast_cli_entry builtins[] = {
...
{ { "reload", NULL }, handle_reload, "Reload configuration", reload_help },
...
        { { "unload", NULL }, handle_unload, "Unload a dynamic module by name", unload_help, complete_fn },
        { { NULL }, NULL, NULL, NULL }
};
}}}

== CDR flow ==
* pbx.c
 * int ast_pbx_run(struct ast_channel *c)
  * if (c->amaflags) {
   * if (c->cdr) {
   * } else {
    * c->cdr = ast_cdr_alloc();
    * ast_cdr_init(c->cdr, c);
   * }
  * }
  * if (c->cdr)
   * ast_cdr_start(c->cdr);

 * int pbx_exec(struct ast_channel *c, struct ast_app *app, void *data, int newstack)
  * if (newstack && (res = setjmp(c->jmp[++c->stack]))) {
  * } else {
   * if (c->cdr)
    * ast_cdr_setapp(c->cdr, app->name, data);
  * }

* channel.c
 * int ast_hangup(struct ast_channel *chan)
  * if (chan->cdr) {
   * ast_cdr_end(chan->cdr);
   * ast_cdr_post(chan->cdr);
   * ast_cdr_free(chan->cdr);
  * }

 * int ast_answer(struct ast_channel *chan)
  * switch(chan->_state) {
  * case AST_STATE_RING:
   * if (chan->cdr)
    * ast_cdr_answer(chan->cdr);
  * }

 * struct ast_frame *ast_read(struct ast_channel *chan)
  * if (!f) {
   * if (chan->cdr)
    * ast_cdr_end(chan->cdr);
  * } else if (chan->deferdtmf && f->frametype == AST_FRAME_DTMF) {
  * } else if ((f->frametype == AST_FRAME_CONTROL) && (f->subclass == AST_CONTROL_ANSWER)) {
   * ast_cdr_answer(chan->cdr);
  * }

* app_dial.c
 * static struct ast_channel *wait_for_answer(struct ast_channel *in, struct localuser *outgoing, int *to, int *allowredir, int *allowdisconnect)
   * ast_cdr_busy(in->cdr);

 * static int dial_exec(struct ast_channel *chan, void *data)
  * ast_cdr_busy(chan->cdr);
  * ast_cdr_setdestchan(chan->cdr, peer->name);

* app_queue.c
 * static struct ast_channel *wait_for_answer(struct ast_channel *in, struct localuser *outgoing, int *to, int *allowredir, int *allowdisconnect, char *queue)
  * ast_cdr_busy(in->cdr);

 * static int try_calling(struct queue_ent *qe, char *options)
  * ast_cdr_busy(qe->chan->cdr);
  * ast_cdr_setdestchan(qe->chan->cdr, peer->name);

* chan_iax.c
 * int set_config(char *config_file, struct sockaddr_in* sin)
  * format = ast_cdr_amaflags2int(v->value);

 * static struct iax_user *build_user(char *name, struct ast_variable *v)
  * format = ast_cdr_amaflags2int(v->value);

* chan_sip.c
 * static struct sip_user *build_user(char *name, struct ast_variable *v)
  * format = ast_cdr_amaflags2int(v->value);

* chan_zap.c
 * static struct ast_channel *zt_request(char *type, int format, void *data)
  * tmp->cdrflags |= AST_CDR_CALLWAIT;

 * int load_module()
  * y = ast_cdr_amaflags2int(v->value);

== cdr function ==

* ast_cdr_alloc
 * alloc cdr

* ast_cdr_free

* ast_cdr_init
 * channel 에서 필요한 사항을 cdr 로 복사.
 * channel 의 상태에 따라 cdr disposition 설정

* ast_cdr_start
 * cdr->start 를 현재시간으로 설정

* ast_cdr_end

* ast_cdr_setapp
 * cdr->lastapp 와 cdr->lastdata 설정
 * pbx_exec 에서 이후 application 을 수행함.
 * call 에 대해 최종으로 수행된 application 을 아르켜 줌.

* ast_cdr_answer
 * cdr->disposition 을 AST_CDR_ANSWERED 로 설정하고
 * cdr->answer 에 현재 시간을 설정.

* ast_cdr_busy
 * cdr->disposition 을 AST_CDR_BUSY 로 설정

* ast_cdr_post
 * cdr->duration 과 cdr->billsec 을 설정하고, i->be(cdr) 을 사용하여 cdr 저장
 * duration 은 start 에서 end 이고 billsec 는 answer 에서 end 까지 임.

* ast_cdr_setdestchan
 * cdr->dstchannel 을 설정

* ast_cdr_amaflags2int

* ast_cdr_disp2str

* ast_cdr_flags2str

* ast_cdr_setaccount


* ast_cdr_end

* ast_cdr_register

* ast_cdr_unregister