[asterisk-bugs] [Asterisk 0017218]: All channels get Congestion following PTP MDL can't handle error of type F message

[Asterisk Bug Tracker]

The following issue requires your FEEDBACK. 
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https://issues.asterisk.org/view.php?id=17218 
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Reported By:                kebl0155
Assigned To:                
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Project:                    Asterisk
Issue ID:                   17218
Category:                   Channels/chan_dahdi
Reproducibility:            random
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           SVN 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2010-04-21 03:47 CDT
Last Modified:              2010-04-26 11:36 CDT
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Summary:                    All channels get Congestion following PTP MDL can't
handle error of type F message
Description: 
Hi there,

We have a travel company in the UK experiencing unusually high call
volumes.

We upraded their asterisk to SVN versions of LibPri (1.4), Dahdi (2.3
branch) and Asterisk (1.6.1) in order to get a patch for another bug.

This morning the system fell over, with all dial attempts to their PBX
giving

Unable to create channel of type 'DAHDI' (cause 34 - Circuit/channel
congestion)

Asterisk had to be restarted to restore service.

This was immediately preceded by the following:

[Apr 21 09:03:14] ERROR[17042] chan_dahdi.c: PTP MDL can't handle error of
type F
[Apr 21 09:03:14] ERROR[17042] chan_dahdi.c: MDL-ERROR (F), SABME in state
7
[Apr 21 09:03:14] ERROR[17042] chan_dahdi.c: PTP MDL can't handle error of
type F
[Apr 21 09:03:14] ERROR[17042] chan_dahdi.c: MDL-ERROR (F), SABME in state
7

They're using a Digium TE205P.  No Alarms were thrown.

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---------------------------------------------------------------------- 
 (0120900) lmadsen (administrator) - 2010-04-26 11:36
 https://issues.asterisk.org/view.php?id=17218#c120900 
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I think the PRI debug just prior and following this happening may be
useful. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-04-26 11:36 lmadsen        Note Added: 0120900                          
2010-04-26 11:36 lmadsen        Status                   new => feedback     
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