http://wanchengbuyi.blog.163.com/blog/static/1664618312010717802059/
在Asterisk PBX 經常會遇到模擬卡Caller ID 無法顯示的問題。這裏做個總結：
(1) 確保線路是標準的PSTN 線
(2) 確保線路具有caller ID 顯示功能
(3) 確定caller ID 的格式，是dtmf 還是fsk 這一步分析錄音文件來確定 dahdi_monitor 通道號 -v -r rx.raw 然後用Adobe Audition來
分析是哪一種類型
(4)確保asterisk配置都正確
[root@server2 ~]# vi /etc/dahdi/system.conf
loadzone = （正確的時區）
defaultzone = （正確的時區）
[root@server2 ~]# vi /etc/asterisk/indications.conf [general]
country=（正確 )
[root@server2 ~]# vi /etc/asterisk/chan_dahdi.conf
callerid=asreceived usecallerid=yes cidsignalling=v23 hideallerid=no cidstart=polarity
這幾項根據自己的具體情況設置 , 加載驅動時加參數opermode=（正確的時區）(大寫)
[root@server2 ~]# dmesg
Module 0: Installed -- AUTO FXO (正確的時區 mode)
Module 1: Installed -- AUTO FXO (正確的時區mode)
(5)用以下dialplan
[from-pstn]
exten => s,1,Wait(3)
exten => s,n,Answer()
exten => s,n,NoOp(${CALLERID(ALL)})
exten => s,n,Hangup()
(6) 打開所有debug信息 [root@server2 ~]# vi /etc/asterisk/logger.conf
error => error
debug => debug
console => notice,warning,error
console => notice,warning,error,debug
messages => notice,warning,error
full => notice,warning,error,debug,verbose
（7）打電話測試 如果有以下顯示信息
[Aug 17 19:42:25] NOTICE[3555]: chan_dahdi.c:6668 ss_thread: CallerID number: 0098675582535362, name: (null), flags=4
[Aug 17 19:42:25] NOTICE[3555]: chan_dahdi.c:6668 ss_thread: CallerID number: 0098675582535362, name: (null), flags=4
[Aug 17 19:42:27] WARNING[3555]: chan_dahdi.c:6685 ss_thread: CID timed out waiting for ring. Exiting simple switch
[Aug 17 19:42:27] WARNING[3555]: chan_dahdi.c:6685 ss_thread: CID timed out waiting for ring. Exiting simple switch
就要修改chan_dahdi.c ，然後重新編譯。
6564 cs = NULL;
6565 ast_log(LOG_DEBUG, "Receiving DTMF cid on "
6566 "channel %s/n", chan->name);
6567 dahdi_setlinear(p->subs[index].dfd, 0);
6568 res = 6000; /* org = 2000*/
6569 for (;;) {
6570 struct ast_frame *f;
6571 res = ast_waitfor(chan, res);
6572 if (res <= 0) {
6573 ast_log(LOG_WARNING, "DTMFCID timed out waiting for ring. "
6574 "Exiting simple switch/n");
6575 ast_hangup(chan);
6576 goto quit;
6577 }
6578 f = ast_read(chan);
6579 if (!f)
6580 break;
6581 if (f->frametype == AST_FRAME_DTMF) {
6582 dtmfbuf[i++] = f->subclass;
6583 ast_log(LOG_DEBUG, "CID got digit '%c'/n", f->subclass);
6584 res = 5000; /* org=2000*/
6585 }
6586 ast_frfree(f);
6676
6677 /* Finished with Caller*ID, now wait for a ring to make sure there really is a call coming */
6678 res = 6000; /* org = 2000*/
6679 }
6680
6681 for (;;) {
6682 struct ast_frame *f;
6683 res = ast_waitfor(chan, res);
6684 if (res <= 0) {
6685 ast_log(LOG_WARNING, "CID timed out waiting for ring. "
6686 "Exiting simple switch/n");
6687 ast_hangup(chan);
6688 goto quit;
6689 }
6690 if (!(f = ast_read(chan))) {
6691 ast_log(LOG_WARNING, "Hangup received waiting for ring. Exiting simple switch/n");
6692 ast_hangup(chan);
6693 goto quit;
6694 }
修改這三個參數的值，然後重新編譯，一般都可以解決問題。