[asterisk-bugs] [Asterisk 0018696]: Asterisk doesn't respond ACK to 200 OK retransmission

[Asterisk Bug Tracker]

The following issue has been UPDATED. 
====================================================================== 
https://issues.asterisk.org/view.php?id=18696 
====================================================================== 
Reported By:                corruptor
Assigned To:                
====================================================================== 
Project:                    Asterisk
Issue ID:                   18696
Category:                   Channels/chan_sip/Interoperability
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.6.2.16.1 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!):  
Request Review:              
====================================================================== 
Date Submitted:             2011-01-28 09:10 CST
Last Modified:              2011-01-28 13:52 CST
====================================================================== 
Summary:                    Asterisk doesn't respond ACK to 200 OK
retransmission
Description: 
It's written in SIP RFC
13.2.2.4 2xx Responses
..The ACK MUST be passed to the client transport every time a
   retransmission of the 2xx final response that triggered the ACK
   arrives.

This probably is not an issue. I've noticed that asterisk doesn't send ACK
when phone retransmitts OK.
I've made a scenario for SIPp to reproduce this issue (it;s attached as
uas_retr.xml). SIPp works in UAS mode and after receiving ACK it sends
another OK to check if asterisk retransmitts ACK but asterisk just ignores
this OK. 
I've attached full asterisk debug log also.

Sorry if am wrong. I might not understand SIP RFC correctly or have done
wrong scenario.
====================================================================== 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-01-28 13:52 lmadsen        Summary                  Asterisk doesn't
repsond ACK to every OK => Asterisk doesn't respond ACK to 200 OK retransmission
======================================================================