[asterisk-bugs] [Asterisk 0016936]: Qualify frequency has big pauses. Asterisk stops sending SIP OPTIONS to keep NAT alive

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=16936 
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Reported By:                ib2
Assigned To:                
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Project:                    Asterisk
Issue ID:                   16936
Category:                   Channels/chan_sip/General
Reproducibility:            sometimes
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.6.2.4 
JIRA:                       SWP-993 
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:             2010-03-01 13:54 CST
Last Modified:              2010-04-20 08:03 CDT
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Summary:                    Qualify frequency has big pauses. Asterisk stops
sending SIP OPTIONS to keep NAT alive
Description: 
We have several SIP phone peers that that becomes UNREACHABLE since
upgrading to Asterisk 1.6.2.x

[10:08:44] chan_sip.c: Peer '202_117' is now UNREACHABLE!  Last qualify:
100
[10:11:25] chan_sip.c: Peer '202_117' is now Reachable. (86ms / 2000ms)
[11:59:03] chan_sip.c: Peer '202_117' is now UNREACHABLE!  Last qualify:
91
[12:11:27] chan_sip.c: Peer '202_117' is now Reachable. (85ms / 2000ms)
[13:17:21] chan_sip.c: Peer '202_117' is now UNREACHABLE!  Last qualify:
90
[13:41:27] chan_sip.c: Peer '202_117' is now Reachable. (92ms / 2000ms)

The phone is UNREACHABLE until it registers again. The phone does not know
that it is UNREACHABLE.
Asterisk reports the phone as UNREACHABLE after a big pause in sending SIP
OPTIONS to keep NAT alive. Therefore NAT table is lost and asterisk cannot
receive SIP OK reply from the phone.

The typical interval between the occurrence is shown above
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 (0120630) lmadsen (administrator) - 2010-04-20 08:03
 https://issues.asterisk.org/view.php?id=16936#c120630 
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Huh, I've seen something similar to this, and it seemed like Asterisk was
sending the OPTIONS packets and the remote phone wouldn't respond.

I'm not sure what else to report here or to ask for. Perhaps when this is
happening, if someone can gather a 'core show locks' and a backtrace from
the running Asterisk process (see
http://svn.asterisk.org/svn/asterisk/trunk/doc/backtrace.txt) using 'thread
apply all bt' we can see if something is happening in terms of a deadlock.

That is just a guess as at this point I'm not entirely sure what to ask
for. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-04-20 08:03 lmadsen        Note Added: 0120630                          
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