[asterisk-bugs] [Asterisk 0015318]: Asterisk can not get channel lock when receiving BYE message which results in 503 error message

[Asterisk Bug Tracker]

The following issue has been RESOLVED. 
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https://issues.asterisk.org/view.php?id=15318 
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Reported By:                ffloimair
Assigned To:                mmichelson
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Project:                    Asterisk
Issue ID:                   15318
Category:                   Channels/chan_sip/Interoperability
Reproducibility:            sometimes
Severity:                   major
Priority:                   normal
Status:                     resolved
Asterisk Version:           1.4.21.1 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
Resolution:                 no change required
Fixed in Version:           
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Date Submitted:             2009-06-12 06:47 CDT
Last Modified:              2009-06-22 08:53 CDT
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Summary:                    Asterisk can not get channel lock when receiving BYE
message which results in 503 error message
Description: 
We have a SIP trunk to an Alcatel PBX running. Sometimes when the Alcatel
side sends us a BYE message, the Asterisk would respond with a 503 error
message. The logs in that case say that Asterisk could not get a channel
lock.

Asterisk version is 1.4.21.1, but the same can be observed with versions
up to 1.4.23.1
I was not yet able to test higher versions because the site is in France
and one of our technicians will fly there on monday. I will update this
post in case 1.4.25.1 does not show this error.
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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2009-06-22 08:53 mmichelson     Status                   feedback => resolved
2009-06-22 08:53 mmichelson     Resolution               open => no change
required
2009-06-22 08:53 mmichelson     Assigned To               => mmichelson      
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