拨号和接入 : 综合业务数字网络 (ISDN),随路信令 (CAS)

ISDN BRI 链路上第二个 B 通道呼叫失败故障排除

2015 年 8 月 28 日 - 机器翻译
其他版本: PDFpdf | 英语 (2015 年 4 月 22 日) | 反馈


目录


简介

多链路点对点协议(MPPP)在ISDN BRI连接使您启动两B信道。MPPP提供128k (2 x 64kbps)在ISDN终端设备之间的带宽。然而,而其他B信道逗留虚度光阴,在许多情况下,路由器能只连接一B信道。在这些情况下本文讨论如何排除故障问题。

注意: 此步骤是主要为与一条BRI链路(即两B信道)的连接。如果使用MPPP捆绑两个或多个BRI (即至少三B信道),参考配置与多个BRI接口的多链路PPP

先决条件

要求

验证路由器是否能彼此连接一B信道。本文包括与另外的多链路信道关连仅的连接失败。如果无法连接一信道参考的ISDN BRI故障排除流程图

除非第一个信道成功,连接请勿继续进行在本文的步骤。

Cisco 建议您了解以下主题:

  • 常规ISDN和按需拨号路由(DDR)配置概念。参考基本ISDN的培训演示和在学习连接欲知更多信息的思科的DDR配置联机。

  • 如何调试ISDN和PPP。您一定能确定路由器是否拨号,连接在ISDN层并且协商PPP。

使用的组件

本文档中的信息基于以下软件和硬件版本:

  • Cisco IOS�软件版本12.1(2)和12.2(2)T

    Cisco在Cisco IOS�软件版本12.1(2)介绍dialer redial命令。以后, Cisco在Cisco IOS软件版本12.2(2)T修改了命令包括其它选项。关于此功能的更多信息,参考重新拨号增强功能

  • 居住的两路由器连接BRI电路。

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始(默认)配置。如果您使用的是真实网络,请确保您已经了解所有命令的潜在影响。

规则

有关文档规则的详细信息,请参阅 Cisco 技术提示规则

问题说明

路由器启动在BRI的两B信道为联络到ISDN对等体。对对等体的连接成功。然而,仅一B信道成功连接。多链路PPP尝试启动另外的B信道,但是呼叫不断地失败。

此图表说明成功的呼叫的呼叫流:

/image/gif/paws/22480/ppp_multilink_ts2.gif

问您必须要求Telco

当您配置并且排除故障多链路时,请询问呼叫的路由器的telco这些问题:

  1. 问题:是否需要拨号一个号码或两个号码连接到两远程B信道?

    答案:

    一个编号:配置单个dialer stringdialer map在本地路由器的物理或拨号接口,如适当。参考步骤4欲知更多信息。继续问2。

    两个编号:在本地路由器上,请配置一dialer mapdialer string每个远端B-信道ISDN号码的。参考步骤4欲知更多信息。

  2. 问题:两个B信道编号在寻找组中配置?

    答案:

    是:这是只需要一个编号连接到两B信道的电路的预计设置。寻找组绑定两个B信道编号(因而主叫方只需要一个编号呼叫)。在第一B信道连接后,呼叫路由器再拨号同一个号码。在远程终端的交换机,最接近呼叫的路由器认为第一B信道忙碌,并且转移在第二B信道上的呼叫和从而成为捆绑可能。

    否:当第一忙碌时,请求Telco配置两个B信道编号在寻找组中和自动地滚动呼叫到第二个数字。如果telco不配置寻找组,请配置dialer redial or isdn fast-rollver delay命令按照Troubleshoot部分的步骤5说明。

故障排除

注意: 在您使用此步骤前,请验证路由器是否用一一B信道彼此连接。如果无法连接一个信道,参考ISDN BRI故障排除流程图

  1. 打开这些调试指令:debug dialerdebug isdn q931debug ppp协商

  2. 为远程设备注定的启动流量。保证有发起足够的流量另外的呼叫。

    提示: 您能使用扩展的ping工具变化数据包/数据包大小和编号ping。参考使用扩展ping和扩展traceroute命令关于如何使用扩展ping的更多信息。

  3. 证实路由器是否尝试第二次呼叫。调试象这样出现:

    *Mar  1 01:30:55.295: BRI3/0 DDR: rotor dialout [priority]
    
    !--- Use BRI 3/0 to dial out.
    
    *Mar  1 01:30:55.295: BRI3/0 DDR: Dialing cause ip 
    (s=10.1.1.1, d=172.22.53.201)
    
    !--- DDR dialing cause is a ping to the remote router.
    
    *Mar  1 01:30:55.295: BRI3/0 DDR: Attempting to dial 5558888
    
    !--- Dial the remote number.
    
    *Mar  1 01:30:55.295: ISDN BR3/0: TX ->  SETUP pd = 8  callref = 0x07
    *Mar  1 01:30:55.299:         Bearer Capability i = 0x8890218F
    *Mar  1 01:30:55.299:         Channel ID i = 0x83
    *Mar  1 01:30:55.299:         Keypad Facility i = '5558888'
  4. 路由器是否尝试第二次呼叫?

    • 是:继续执行步骤 5。

    • 否:暗示是路由器没有为多链路PPP适当地配置。配置这些命令:

      命令 说明
      PPP 多链路 配置ppp multilink命令(在路由器)在物理接口和拨号接口下(如果使用拨号配置文件)。

      注意: 如果添加此命令,您必须断开所有现有连接为您要运用的新的多链路参数然后重新连接。在呼叫建立期间,多链路协商发生。所以,对多链路的任何更改在完成LCP协商的连接没有实现。

      dialer load-threshold 5 outbound 建立接口负载(从1到255)在之外拨号程序发起另一呼叫对目的地。带宽是比率255,其中255是可用的带宽的100百分比。在本例中,当在链路的出站负载是5/255或2百分比时,另外的信道出来。变化根据您的需要的此值。

      提示: 用户有时配置dialer load-threshold 1命令立即使用所有B信道每呼叫。在此配置后的理论是,如果所有B信道立即上升,并且每呼叫使用整个ISDN管道,呼叫一定是短在持续时间,因为用户数据需要较少时刻转接。

      当此理论是合理的时,思科实践上建议您未曾设置您的dialer load-threshold值对任何东西少于3。如果集此值对少于3,多个ISDN信道立即上升,并且导致在两个信道和疏忽的争用连接之间任何一个。
      dialer map IP地址名称名称编号dialer string编号 配置一dialer map (或dialer string)每个远端B-信道ISDN号码的。IP地址和名称对于两个语句必须是相同的,只有ISDN编号一定不同的。示例:
      dialer map ip 192.168.1.1 name asc001 13305551111
      dialer map ip 192.168.1.1 name asc001 13305551112
      dialer string 13305551111
      dialer string 13305551112

      注意: 如果Telco通知您您只需要拨号一个号码,您只需要一个dialer map或拨号字符串语句。

      关于多链路PPP的配置选项的更多信息,参考DDR的多链路PPP -基本配置和验证

  5. 配置这些命令之一在物理或拨号接口下:

    • 拨号程序重拨间隔5尝试3 —在拨号尝试之间的间隔是五秒,最多的三尝试。

      此间隔允许在重拨尝试前将被切断的完全旧有呼叫。

    • isdn fast-rollover-delay 5 —设置反转延迟在5秒。

      提供此延迟允许在新的呼叫尝试前将被切断的完全旧有呼叫。此命令是必要的在一些ISDN交换机,因为新的呼叫尝试能发生,在旧有呼叫完全被切断前。这导致第二次呼叫发生故障。

示例输出

此部分为一成功和一不成功呼叫提供一配置示例和debug输出。请使用此部分作为参考检查调试您是否观察匹配显示的那个此处:

ppp_multilink_ts1.gif

interface BRI1/0
 ip address 192.168.1.111 255.255.255.0
 encapsulation ppp
 dialer map ip 192.168.1.1 name asc001 13305551111
 dialer map ip 192.168.1.1 name asc001 13305551112
 
!--- Notice that the dialer map statements are identical except for 
 !--- the phone numbers to dial. 
 !--- The numbers correspond to the ISDN numbers of the remote BRI.
 !--- This router will use the first dialer map, then the second dialer map. 

 dialer load-threshold 1 either

 !--- Set the load-threshold to the required value and direction dialer-group 1.

 isdn switch-type basic-ni
 isdn spid1 25255588880101 5558888
 isdn spid2 25255588890101 5558889 
 isdn fast-rollover-delay 5
 

 !--- Rollover delay is set to 5 seconds.

 ppp authentication chap pap callin
 ppp multilink

 !--- Enable multilink on the interface.

激活debug isdn q931debug ppp协商并且启动ping对远程终端IP地址。

asc011#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
Aug 24 16:30:35.651 est: ISDN BR1/0: TX -> SETUP pd = 8 callref = 0x3B
Aug 24 16:30:35.655 EST: Bearer Capability i = 0x8890218F
Aug 24 16:30:35.655 EST: Channel ID i = 0x83
Aug 24 16:30:35.659 EST: Keypad Facility i = '13305551111' 

!--- Calling out with the number specified in the first dialer map.

Aug 24 16:30:35.896 EST: ISDN BR1/0: RX <- CALL_PROC pd = 8 callref = 0xBB
Aug 24 16:30:35.896 EST: Channel ID i = 0x89
Aug 24 16:30:35.900 EST: Locking Shift to Codeset 5
Aug 24 16:30:35.900 EST: Codeset 5 IE 0x2A i = 0x80880B,'13305551111', 
  0x800109800114800114800114..
Aug 24 16:30:38.877 EST: ISDN BR1/0: RX <- ALERTING pd = 8 callref = 0xBB
Aug 24 16:30:38.881 EST: Signal i = 0x01 - Ring back tone on
Aug 24 16:30:38.929 EST: ISDN BR1/0: RX <- CONNECT pd = 8 callref =0xBB
Aug 24 16:30:38.929 EST: Signal i = 0x3F - Tones off
Aug 24 16:30:38.937 EST: %LINK-3-UPDOWN: Interface BRI1/0:1, changed state to up
Aug 24 16:30:38.941 EST: BR1/0:1 PPP: Treating connection as a callout
Aug 24 16:30:38.945 EST: BR1/0:1 PPP: Phase is ESTABLISHING, Active Open
  [0 sess , 0 load]
Aug 24 16:30:38.945 EST: BR1/0:1 PPP: No remote authentication for call-out
Aug 24 16:30:38.945 EST: BR1/0:1 LCP: O CONFREQ [Closed] id 5 len 23
Aug 24 16:30:38.945 EST: BR1/0:1 LCP: MagicNumber 0x55EE5FC7 (0x050655EE5FC7)
Aug 24 16:30:38.945 EST: BR1/0:1 LCP: MRRU 1524 (0x110405F4)
Aug 24 16:30:38.949 EST: BR1/0:1 LCP: EndpointDisc 1 Local 
  (0x130901617363303131)
Aug 24 16:30:38.949 EST: ISDN BR1/0: TX -> CONNECT_ACK pd = 8 callref = 0x3B
...

!--- Output omitted.

...
Aug 24 16:30:39.009 EST: BR1/0:1 LCP: I CONFACK [ACKsent] id 5 Len 23
Aug 24 16:30:39.009 EST: BR1/0:1 LCP: MagicNumber 0x55EE5FC7(0x050655EE5FC7)
Aug 24 16:30:39.009 EST: BR1/0:1 LCP: MRRU 1524 (0x110405F4)
Aug 24 16:30:39.009 EST: BR1/0:1 LCP: EndpointDisc 1 Local 
  (0x130901617363303131)
Aug 24 16:30:39.013 EST: BR1/0:1 LCP: State is Open
Aug 24 16:30:39.013 EST: BR1/0:1 PPP:Phase is AUTHENTICATING, by the peer
  [0 sess, 0 load]
Aug 24 16:30:39.057 EST: BR1/0:1 CHAP: I CHALLENGE id 151 Len 27 from "asc001"
Aug 24 16:30:39.061 EST: BR1/0:1 CHAP: O RESPONSE id 151 Len 27 from "asc011"
Aug 24 16:30:39.109 EST: BR1/0:1 CHAP: I SUCCESS id 151 Len 4

!--- Authentication is successful.

Aug 24 16:30:39.109 EST: BR1/0:1 PPP: Phase is VIRTUALIZED [0 sess, 0 load]
Aug 24 16:30:39.113 EST: Vi1 PPP: Phase is DOWN, Setup [0 sess, 0 load]
Aug 24 16:30:39.121 EST: %LINK-3-UPDOWN: Interface Virtual-Access1,
changed state to up
Aug 24 16:30:39.121 EST: Vi1 PPP: Treating connection as a callout
Aug 24 16:30:39.121 EST: Vi1 PPP: Phase is ESTABLISHING, Active Open [0sess, 0load]
Aug 24 16:30:39.125 EST: Vi1 PPP: No remote authentication for call-out
Aug 24 16:30:39.125 EST: Vi1 LCP: O CONFREQ [Closed] id 1 Len 23
Aug 24 16:30:39.125 EST: Vi1 LCP: MagicNumber 0x55EE6079(0x050655EE6079)
Aug 24 16:30:39.125 EST: Vi1 LCP: MRRU 1524 (0x110405F4)
Aug 24 16:30:39.125 EST: Vi1 LCP: EndpointDisc 1 Local (0x130901617363303131)
Aug 24 16:30:39.129 EST: Vi1 PPP: Phase is UP [0 sess, 0 load]
Aug 24 16:30:39.129 EST: Vi1 IPCP: O CONFREQ [Closed] id 1 Len 10
Aug 24 16:30:39.129 EST: Vi1 IPCP: Address 192.168.1.111(0x0306C0A8016F)
Aug 24 16:30:39.137 EST: Vi1 IPCP: I CONFREQ [REQsent] id 1 Len 10
Aug 24 16:30:39.137 EST: Vi1 IPCP: Address 192.168.1.1 (0x0306C0A80101)
Aug 24 16:30:39.137 EST: Vi1 IPCP: O CONFACK [REQsent] id 1 Len 10
Aug 24 16:30:39.137 EST: Vi1 IPCP: Address 192.168.1.1 (0x0306C0A80101)
Aug 24 16:30:39.177 EST: Vi1 IPCP: I CONFACK [ACKsent] id 1 Len 10
Aug 24 16:30:39.177 EST: Vi1 IPCP: Address 192.168.1.111 (0x0306C0A8016F)
Aug 24 16:30:39.181 EST: Vi1 IPCP: State is Open
Aug 24 16:30:39.185 EST: BR1/0 IPCP: Install route to 192.168.1.1

!--- First call is successful. We will now initiate the additional call.

Aug 24 16:30:39.754 EST: ISDN BR1/0: TX -> SETUP pd = 8 callref = 0x3C
Aug 24 16:30:39.754 EST: Bearer Capability i = 0x8890218F
Aug 24 16:30:39.758 EST: Channel ID i = 0x83
Aug 24 16:30:39.762 EST: Keypad Facility i = '13305551111' 

!--- We once again dial out with the first dialer map (the expected behavior).
!--- This call fails and router rolls over to use the second dialer map.

Aug 24 16:30:39.995 EST: ISDN BR1/0: RX <- CALL_PROC pd = 8 callref = 0xBC
Aug 24 16:30:39.995 EST: Channel ID i = 0x8A
Aug 24 16:30:39.999 EST: Locking Shift to Codeset 5
Aug 24 16:30:39.999 EST: Codeset 5 IE 0x2A i = 
  0x80880B,'13305551111',0x800109800114800114800114
Aug 24 16:30:40.111 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI1/0:1,
  changed state to up
Aug 24 16:30:40.131 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface
  Virtual-Access1, changed state to up
Aug 24 16:30:41.209 EST: BR1/0:1 LCP: I ECHOREQ [Open] id 1 Len 12 magic 0x8EFDDF16
Aug 24 16:30:41.209 EST: BR1/0:1 LCP: O ECHOREP [Open] id 1 Len 12 magic 0x55EE5FC7
Aug 24 16:30:42.779 EST: ISDN BR1/0: RX <- DISCONNECT pd = 8 callref = 0xBC
Aug 24 16:30:42.783 EST: Cause i = 0x8291 - User busy
Aug 24 16:30:42.783 EST: Signal i = 0x04 - Busy tone on

!--- The call fails. The remote switch sends a message that the B-channel is busy.
!--- Upon receipt of this disconnect, the router dials the second dialer map.
!--- If you do not receive this Disconnect within a certain timeframe, the router
!--- does not attempt another call. The dialer redial or isdn fast-rollover
!--- commands can fix this issue.

Aug 24 16:30:42.795 EST: %ISDN-6-CONNECT: Interface BRI1/0:1 is now connected to
  13305551111 asc001
Aug 24 16:30:42.807 EST: ISDN BR1/0: TX -> RELEASE pd = 8 callref = 0x3C
Aug 24 16:30:42.831 EST: ISDN BR1/0: TX -> SETUP pd = 8 callref = 0x3D
Aug 24 16:30:42.835 EST: Bearer Capability i = 0x8890218F
Aug 24 16:30:42.835 EST: Channel ID i = 0x83
Aug 24 16:30:42.839 EST: Keypad Facility i = '13305551112'

!--- Dial with the second dialer map.

Aug 24 16:30:42.927 EST: ISDN BR1/0: RX <- RELEASE_COMP pd = 8 callref = 0xBC
Aug 24 16:30:42.931 EST: Signal i = 0x3F - Tones off
Aug 24 16:30:43.096 EST: ISDN BR1/0: RX <- CALL_PROC pd = 8 callref = 0xBD
Aug 24 16:30:43.096 EST: Channel ID i = 0x8A
Aug 24 16:30:43.100 EST: Locking Shift to Codeset 5 asc011#
Aug 24 16:30:43.100 EST: Codeset 5 IE 0x2A i = 0x80880B, '13305551112'
  ,0x800109800114800114800114
Aug 24 16:30:46.329 EST: ISDN BR1/0: RX <- ALERTING pd = 8 callref = 0xBD
Aug 24 16:30:46.329 EST: Signal i = 0x01 - Ring back tone on
Aug 24 16:30:46.361 EST: ISDN BR1/0: RX <- CONNECT pd = 8 callref = 0xBD
Aug 24 16:30:46.361 EST: Signal i = 0x3F - Tones off
Aug 24 16:30:46.373 EST: %LINK-3-UPDOWN: Interface BRI1/0:2, changed state to up
Aug 24 16:30:46.373 EST: BR1/0:2 PPP: Treating connection as a callout
...

!--- Output omitted.

...
Aug 24 16:30:46.445 EST: BR1/0:2 LCP: State is Open
Aug 24 16:30:46.445 EST: BR1/0:2 PPP: Phase is AUTHENTICATING, by the peer 
  [0 sess, 1 load]
Aug 24 16:30:46.489 EST: BR1/0:2 CHAP: I CHALLENGE id 31 Len 27 from "asc001"
Aug 24 16:30:46.493 EST: BR1/0:2 CHAP: O RESPONSE id 31 Len 27 from "asc011"
Aug 24 16:30:46.542 EST: BR1/0:2 CHAP: I SUCCESS id 31 Len 4
Aug 24 16:30:46.542 EST: BR1/0:2 PPP: Phase is VIRTUALIZED [0 sess, 1 load]
Aug 24 16:30:46.546 EST: BR1/0:2 MLP: asc001, multilink up
Aug 24 16:30:47.343 EST: BR1/0:1 LCP: I ECHOREP [Open] id 1 Len 12 magic 
  0x8EFDDF16
Aug 24 16:30:47.343 EST: BR1/0:1 LCP: Received id 1, sent id 1, line up
Aug 24 16:30:47.343 EST: BR1/0:2 LCP: I ECHOREP [Open] id 1 Len 12 magic 
  0x8EFDFC22
Aug 24 16:30:47.347 EST: BR1/0:2 LCP: Received id 1, sent id 1, line up
Aug 24 16:30:47.543 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface BRI1/0:2,
  changed state to up

!--- The 2 B-channel Call connects.

asc011#

请使用show isdn active命令检查连接。注释每呼出的被叫号码。

--------------------------------------------------------------------------------
ISDN ACTIVE CALLS
--------------------------------------------------------------------------------
Call   Calling   Called  Remote  Seconds  Seconds   Seconds  Charges
Type    Number   Number  Name     Used    Left      Idle     Units/Currency
--------------------------------------------------------------------------------
Out         +3305551111 asc001         55 Unavail    0         0
Out         +3305551112 asc001         48 Unavail    0         0
-------------------------------------------------------------------------------

此示例显示失败呼叫。若干毫不相关的输出省略。


asc008#ping 192.168.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.1, timeout is 2 seconds:
Aug 21 09:33:17.627 EST: BR1/0 DDR: Dialing cause ip (s=192.168.1.108,d=192.168.1.1)
Aug 21 09:33:17.627 EST: BR1/0 DDR: Attempting to dial 13305551111
Aug 21 09:33:17.635 EST: ISDN BR1/0: TX -> SETUP pd = 8 callref = 0x0C
Aug 21 09:33:17.639 EST: Bearer Capability i = 0x8890
Aug 21 09:33:17.639 EST: Channel ID i = 0x83
Aug 21 09:33:17.639 EST: Keypad Facility i = '13305551111'

!--- Calling out with the number specified in the first dialer map.

Aug 21 09:33:18.184 EST: ISDN BR1/0: RX <- CALL_PROC pd = 8 callref = 0x8C
Aug 21 09:33:18.184 EST: Channel ID i = 0x89.
Aug 21 09:33:20.532 EST: ISDN BR1/0: RX <- ALERTING pd = 8 callref =0x8C
Aug 21 09:33:20.536 EST: Signal i = 0x01 - Ring back tone on
Aug 21 09:33:20.564 EST: ISDN BR1/0: RX <- CONNECT pd = 8 callref =0x8C
Aug 21 09:33:20.568 EST: Signal i = 0x3F - Tones off
Aug 21 09:33:20.572 EST: %LINK-3-UPDOWN: Interface BRI1/0:1, changed state to up
Aug 21 09:33:20.576 EST: BR1/0:1 PPP: Treating connection as a callout
Aug 21 09:33:20.580 EST: BR1/0:1 PPP: Phase is ESTABLISHING, Active Open
  [0 sess, 1 load]
...

! --Output omitted.

...
Aug 21 09:33:20.660 EST: BR1/0:1 LCP: State is Open
Aug 21 09:33:20.660 EST: BR1/0:1 PPP: Phase is AUTHENTICATING, by the peer 
  [0 sess, 1 load]
Aug 21 09:33:20.720 EST: BR1/0:1 CHAP: I CHALLENGE id 127 Len 27 from "asc001"
Aug 21 09:33:20.720 EST: BR1/0:1 CHAP: O RESPONSE id 127 Len 27 from "asc008"
Aug 21 09:33:20.784 EST: BR1/0:1 CHAP: I SUCCESS id 127 Len 4

!--- Authentication is successful.

Aug 21 09:33:20.784 EST: BR1/0:1 PPP: Phase is VIRTUALIZED [0 sess, 1 load]
Aug 21 09:33:20.784 EST: Vi1 PPP: Phase is DOWN, Setup [0 sess, 1 load]
Aug 21 09:33:20.792 EST: %LINK-3-UPDOWN: Interface Virtual-Access1,
  changed state to up
...

!--- Output omitted.

...
Aug 21 09:33:20.864 EST: Vi1 IPCP: Address 192.168.1.108(0x0306C0A8016C)
Aug 21 09:33:20.864 EST: Vi1 IPCP: State is Open
Aug 21 09:33:20.868 EST: Vi1 DDR: dialer protocol up
Aug 21 09:33:20.868 EST: BR1/0 IPCP: Install route to 192.168.1.1
Aug 21 09:33:21.089 EST: BR1/0 DDR: Attempting to dial 13305551111
Aug 21 09:33:21.093 EST: ISDN BR1/0: TX -> SETUP pd = 8 callref = 0x0D
Aug 21 09:33:21.097 EST: Bearer Capability i = 0x8890
Aug 21 09:33:21.097 EST: Channel ID i = 0x83
Aug 21 09:33:21.101 EST: Keypad Facility i = '13305551111'

!--- The second call is dialed out with the first dialer map.
!--- The first B-channel on the remote BRI is in use. You must receive a
!--- Disconnect(cause code:busy).

Aug 21 09:33:21.581 EST: ISDN BR1/0: RX <- CALL_PROC pd = 8 callref =0x8D
Aug 21 09:33:21.581 EST: Channel ID i = 0x8A
Aug 21 09:33:21.786 EST: %LINEPROTO-5-UPDOWN: Line protocol on 
  InterfaceBRI1/0:1, changed state to up
Aug 21 09:33:21.802 EST: %LINEPROTO-5-UPDOWN: Line protocol on Interface 
  Virtual -Access1, changed state to up
Aug 21 09:33:23.577 EST: ISDN BR1/0: RX <- PROGRESS pd = 8 callref = 0x8D
Aug 21 09:33:23.577 EST: Cause i = 0x8491 - User busy
Aug 21 09:33:23.581 EST: Progress Ind i = 0x8488 - In-band info or appropriate
  now available

!--- In this case, the "Rx <- PROGRESS" is returned, the CALLED 
!--- router does not even try to call out on the second number because the router  
!--- assumes the call is in progress. You must receive a DISCONNECT for the router
!--- to dial the second number.

Aug 21 09:33:26.578 EST: %ISDN-6-CONNECT: Interface BRI1/0:1 is now 
  connected to 13305551111 asc001
Aug 21 09:33:51.091 EST: BRI1/0: wait for isdn carrier timeout, call  nbid=0x8010
Aug 21 09:33:51.091 EST: BR1/0 DDR: Attempting to dial 13305551112
Aug 21 09:33:51.099 EST: ISDN BR1/0: TX -> DISCONNECT pd = 8 callref = 0x0D
Aug 21 09:33:51.103 EST: Cause i = 0x8090 - Normal call clearing
Aug 21 09:33:51.147 EST: ISDN BR1/0: RX <- RELEASE pd = 8 callref = 0x8D
Aug 21 09:33:51.155 EST: ISDN BR1/0: TX -> RELEASE_COMP pd = 8 callref = 0x0Di

!--- No CONNECT follows the PROGRESS, and so the ISDN carrier times out.
!--- Interestingly the ISDN dialer calls out, but the IOS 
!--- disconnects the same (due to the expiry of certain dialer timers).

请使用show isdn active命令检查连接。注意仅一连接是活跃的。

--------------------------------------------------------------------------------
ISDN ACTIVE CALLS
--------------------------------------------------------------------------------
Call     Calling    Called    Remote    Seconds    Seconds  Seconds    Charges
Type     Number     Number     Name       Used      Left       Idle 
Units/Currency
--------------------------------------------------------------------------------
Out             +3305551111  asc001       25       Unavail      0         0
--------------------------------------------------------------------------------

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Document ID: 22480