[asterisk-bugs] [Asterisk 0017574]: Unable to transfer to Microsoft OCS

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=17574 
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Reported By:                parisioa
Assigned To:                
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Project:                    Asterisk
Issue ID:                   17574
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.6.2.9 
JIRA:                        
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:             2010-07-01 02:32 CDT
Last Modified:              2010-07-07 16:56 CDT
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Summary:                    Unable to transfer to Microsoft OCS
Description: 
I am able to receive a call from Qwest to any of my desk phones.  I am able
to receive a call from flowroute or bandwidth.com and transfer it to
microsoft OCS, but i am NOT able to receive a call and transfer it from
Qwest to OCS.  The call fails.  I am attaching 4 files.  The good call
examples are calls from flowroute, the bad are from qwest.  I've tested
this against 1.6.1.18, 1.6.2.9, and the SVN  SVN-branch-1.6.2-r273271.  
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 (0124323) parisioa (reporter) - 2010-07-07 16:56
 https://issues.asterisk.org/view.php?id=17574#c124323 
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here's the technical answer

Well, we found that the calls to the Microsoft OCS application were not
receiving a provisional 1xx, after the initial 100 Trying message, within
the configured 2000ms inter-message timer. As a result,the Qwest SBC would
cancel the call 2000ms after receipt of the 100 Trying message. 
 
The calls that completed to your extension, were doing so because the PBX
was sending the 180 message back to the Qwest SBC within the allotted
2000ms inter-message timer.
 
To remedy this, Tier III bumped up the inter-message timer to it's max
value (10000ms) and the calls to the Microsoft OCS application are now
completing. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-07-07 16:56 parisioa       Note Added: 0124323                          
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