Constant Dialback problem

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Mar 17th, 2003
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I have a 3640, IOS 12.2.12a and every now and then I get a user calling me for help as they are being dialled back continueously every minute even when there is no PC attached to the phone. The dialer shows a huge number of failed attempts. The only way I can find to stop this is to shut the interface and later reload the router.


This is very frustrating, does anyone have any ideas?


Thanks

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tepatel Mon, 03/17/2003 - 08:54
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I assume that 3640 is calling back to the users right. We need to see the running config from 3640 router. Also you can turn on "debug dialer" to see which traffic is triggring the line for callout. So turn on following debug and post it here with running config.


debug dialer

debug isdn q931

trevora Tue, 03/18/2003 - 01:04
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Here are the relevant parts of the config and debugs. We now have 3 users with this problem and the only way to stop it is to shut the Async port, but as soon as I open it then it starts dialing again. The only way to stop it semi permanently is to reload the router.


It looks like broadcast traffic from the loopback, but why does it only happen now and then?




interface Loopback1

ip address 196.5.65.254 255.255.255.0


interface Serial2/0:15

description ##### CONTROL CHANNEL FOR PRIMARY RATE ISDN #####

no ip address

encapsulation ppp

dialer rotary-group 1

isdn switch-type primary-net5

isdn incoming-voice modem

isdn sending-complete

no cdp enable

!

interface Group-Async1

description ##### INTERFACE FOR ASYNC DIAL-IN USERS #####

ip unnumbered Loopback1

encapsulation ppp

dialer in-band

dialer idle-timeout 1800

dialer-group 1

async dynamic routing

async mode dedicated

peer default ip address pool ASYNC

ppp callback permit

ppp authentication ms-chap pap

group-range 97 108

!

interface Dialer1

description ##### INTERFACE FOR ISDN DIAL-IN USERS #####

ip unnumbered Loopback1

encapsulation ppp

no ip route-cache

no ip mroute-cache

dialer in-band

dialer idle-timeout 1800

dialer-group 1

peer default ip address pool ISDN

no cdp enable

ppp callback permit

ppp authentication ms-chap pap

ppp multilink

multilink max-links 2

multilink min-links 1

multilink load-threshold 150 either



dialer-list 1 protocol ip permit



line 97 108

flush-at-activation

script dialer micaout

script modem-off-hook offhook

modem InOut

modem autoconfigure type mica

transport input telnet

autoselect during-login

autoselect ppp



results of:

debug dialer

debug isdn q931


rzaeldcsaDMZ#sh dialer int as106


As106 - dialer type = IN-BAND ASYNC NO-PARITY

Idle timer (1800 secs), Fast idle timer (20 secs)

Wait for carrier (30 secs), Re-enable (15 secs)

Dialer state is call pending

Dial reason: ip (s=196.5.65.254, d=255.255.255.255)


Dial String Successes Failures Last DNIS Last status

0,7482571 1 1283 00:00:45 failed

rzaeldcsaDMZ#

rzaeldcsaDMZ#

rzaeldcsaDMZ#

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: CHAT106: Chat script micaout finished, status = Connection timed out; remo

te host not responding

1w0d: As106 DDR: disconnecting call

1w0d: ISDN Se2/0:15: TX -> DISCONNECT pd = 8 callref = 0x06AA

1w0d: Cause i = 0x8090 - Normal call clearing

1w0d: ISDN Se2/0:15: RX <- RELEASE pd = 8 callref = 0x86AA

1w0d: ISDN Se2/0:15: TX -> RELEASE_COMP pd = 8 callref = 0x06AA

1w0d: As106 DDR: re-enable timeout

1w0d: As106 DDR: Dialing cause ip (s=196.5.65.254, d=255.255.255.255)

1w0d: As106 DDR: Attempting to dial 0,7482571

1w0d: CHAT106: Attempting async line dialer script

1w0d: CHAT106: Dialing using Modem script: micaout & System script: none

1w0d: CHAT106: process started

1w0d: CHAT106: Asserting DTR

1w0d: CHAT106: Chat script micaout started

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: Di2 DDR: Cannot place call, no dialer string set

1w0d: ISDN Se2/0:15: TX -> SETUP pd = 8 callref = 0x06AB

1w0d: Sending Complete

1w0d: Bearer Capability i = 0x8090A3

1w0d: Channel ID i = 0xA9839F

1w0d: Called Party Number i = 0x81, '07482571', Plan:ISDN, Type:Unknown

1w0d: ISDN Se2/0:15: RX <- CALL_PROC pd = 8 callref = 0x86AB

1w0d: Channel ID i = 0xA9839F

1w0d: ISDN Se2/0:15: RX <- ALERTING pd = 8 callref = 0x86AB

1w0d: Progress Ind i = 0x8088 - In-band info or appropriate now availabl

e

1w0d: Progress Ind i = 0x8282 - Destination address is non-ISDN

rzaeldcsaDMZ#

rzaeldcsaDMZ#

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