ISDN keep dropping after 20 second

Unanswered Question
Sep 29th, 2008
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Hi all,


I have a ISDN issue here, ISDN keep dropping after 20 second exactly, below is the debug captured during the problem:


Sep 30 00:41:19.870 GMT: BR0/3/0:1 DDR: disconnecting call

Sep 30 00:41:19.870 GMT: DDR: Dialer Watch: watch-group = 8

Sep 30 00:41:19.870 GMT: DDR: network x.x.x.x/255.255.255.255 UP,

Sep 30 00:41:19.870 GMT: DDR: primary UP

Sep 30 00:41:19.870 GMT: ISDN BR0/3/0 EVENT: UserIdle: callid 0x800D received ISDN_HANGUP (0x1)

Sep 30 00:41:19: %ISDN-6-DISCONNECT: Interface BRI0/3/0:1 disconnected from 19734103188 , call lasted 20 seconds

Sep 30 00:41:19.870 GMT: ISDN BR0/3/0 Q921: User TX -> INFO sapi=0 tei=68, ns=47 nr=48

Sep 30 00:41:19.870 GMT: ISDN BR0/3/0 Q931: DISCONNECT pd = 8 callref = 0x0D

Cause i = 0x8090 - Normal call clearing


Suspect it could be local telco issue, however, telco already feedback that their side is clean, please kindly advise.



Router#sh isdn his

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ISDN CALL HISTORY

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Call History contains all active calls, and a maximum of 100 inactive calls.

Inactive call data will be retained for a maximum of 15 minutes.

--------------------------------------------------------------------------------

Call Calling Called Remote Seconds Seconds Seconds Charges

Type Number Number Name Used Left Idle Units/Currency

--------------------------------------------------------------------------------

Out ---N/A--- +2222222222 20 0

Out ---N/A--- +2222222222 20 0

--------------------------------------------------------------------------------


Thank you,

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Danilo Dy Mon, 09/29/2008 - 17:40
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Thus your ISDN port a U interface and you are using a straight-through cable? It may sound strange but try using RJ11 telephone cable :)

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