[asterisk-bugs] [Asterisk 0011736]: sip hung channels and UDP ports

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A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=11736 
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Reported By:                MVF
Assigned To:                oej
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Project:                    Asterisk
Issue ID:                   11736
Category:                   Channels/chan_sip/General
Reproducibility:            sometimes
Severity:                   minor
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.4.17 
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             01-10-2008 15:16 CST
Last Modified:              01-22-2008 14:40 CST
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Summary:                    sip hung channels and UDP ports
Description: 
 I've found that some sip channels of some SIP-SIP calls are not being
released by asterisk. Issuing the command "show channels" display the exact
information for active calls but if I use the "sip show channels" command
it shows the active calls plus a lot of hung channels (check attach).

 I´ve checked the "sip show history" of these hung channels and found
that sometimes due to network problems (or redundant termination) asterisk
could receive a "183 Session Progress" message from termination peer after
a CANCEL message has been received from calling party. This problem causes
that * CancelDestroy a non existing call resulting in a hung sip channel
and UDP ports related to it taken. After some time of operation asterisk
stop processing new calls. Please check the sip show history for a hung
peer (originating peer):

  * SIP Call
1. NewChan         Channel SIP/SIP_LCR-097a7500 - from
4e061fc824c28fdb500a7d6e748
2. TxReqRel        INVITE / 102 INVITE - -UNKNOWN-
3. Rx              SIP/2.0 / 102 INVITE / 100 trying
4. Cancel          Cause Normal Clearing
5. SchedDestroy    32000 ms
6. TxReqRel        CANCEL / 102 CANCEL - -UNKNOWN-
7. SchedDestroy    32000 ms
8. Rx              SIP/2.0 / 102 CANCEL / 200 ok
9. Rx              SIP/2.0 / 102 INVITE / 183 Session Progress 
10. CancelDestroy   
11. Rx              SIP/2.0 / 102 INVITE / 404 Not Found
12. TxReq           ACK / 102 ACK - -UNKNOWN-

You can see how after the cancelling exchange a late 183 arrive from
termination peer and confuze * making it to execute a CancelDestroy over a
no more existing peer.

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---------------------------------------------------------------------- 
 MVF - 01-22-08 14:40  
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Hi oej, thanks for the patch. I´ve just installed it on my 1.4.17
asterisk, it will be running with moderate to high traffic (aprox. 30
simultaneous calls) from now on so I will see soon if hung sip channels are
still there. I´ll be reporting tomorrow.

Just for the record, I attached a core channels and sip channels report of
asterisk 1.4.17 before applying the patch
(show_channels-sip_show_channels-prepatch.txt). 

Issue History 
Date Modified   Username       Field                    Change               
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01-22-08 14:40  MVF            Note Added: 0081041                          
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