[asterisk-bugs] [Asterisk 0018633]: asterisk does not respond with ACK on retransmission of 200 OK after it sent ACK

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
====================================================================== 
https://issues.asterisk.org/view.php?id=18633 
====================================================================== 
Reported By:                rrevels
Assigned To:                
====================================================================== 
Project:                    Asterisk
Issue ID:                   18633
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     acknowledged
Asterisk Version:           Older 1.6.2 - please test a newer version 
JIRA:                       SWP-3143 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
====================================================================== 
Date Submitted:             2011-01-17 09:31 CST
Last Modified:              2011-04-29 17:24 CDT
====================================================================== 
Summary:                    asterisk does not respond with ACK on retransmission
of 200 OK after it sent ACK
Description: 
Upstream blocking causes the first ACK to be dropped before hitting
destination.  Retransmitted 200s show up in network trace on Asterisk
server but no ACK response is ever generated
====================================================================== 

---------------------------------------------------------------------- 
 (0134282) jcovert (reporter) - 2011-04-29 17:24
 https://issues.asterisk.org/view.php?id=18633#c134282 
---------------------------------------------------------------------- 
This problem exists in 1.6.2.17.  Please see the uploaded trace.txt.  Cisco
Call Manager doesn't see our ACK due to packet loss and times out
re-sending OK, since we never respond.

One of my clients (who thought 1.6.2.17 was the latest version and
installed it) connected a new VPN to a new remote site and was having about
1% of their calls drop after about 20 seconds.  A ping test shows 1% packet
loss.

The patch above looks like it would solve it.  My client will allow me to
install the patch after operations stop late tonight, and I will confirm
tomorrow.  The patch is also not in 1.6.2.18, but appears to be in most
1.8.x versions. 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-04-29 17:24 jcovert        Note Added: 0134282                          
======================================================================