[asterisk-bugs] [Asterisk 0016025]: [patch] failed to negiotate t38

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=16025 
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Reported By:                jamicque
Assigned To:                kpfleming
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Project:                    Asterisk
Issue ID:                   16025
Category:                   Channels/chan_sip/T.38
Reproducibility:            always
Severity:                   crash
Priority:                   normal
Status:                     assigned
Asterisk Version:           1.6.0.15 
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:             2009-10-06 10:16 CDT
Last Modified:              2009-10-12 09:40 CDT
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Summary:                    [patch] failed to negiotate t38
Description: 
I found a problem today, after upgrading from 1.4.x to 1.6.0.15.
When I try to send fax using t38 with ZOIPER softphone thru asterisk to mu
VoIP operator, asterisk fails to negotiate T38.

I found that after the ZOIPER send reinvite with t38, asterisk sends this
reinvite to operator. And then Asterisk send reinvite to operator with g711
??


The asterisk LOG and cap file is in attachment.
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 (0112207) svnbot (reporter) - 2009-10-12 09:40
 https://issues.asterisk.org/view.php?id=16025#c112207 
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Repository: asterisk
Revision: 223655

_U  branches/1.6.2/
U   branches/1.6.2/apps/app_fax.c
U   branches/1.6.2/channels/chan_sip.c

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r223655 | kpfleming | 2009-10-12 09:40:58 -0500 (Mon, 12 Oct 2009) | 20
lines

Merged revisions 223652 via svnmerge from 
https://origsvn.digium.com/svn/asterisk/trunk

........
  r223652 | kpfleming | 2009-10-12 09:25:29 -0500 (Mon, 12 Oct 2009) | 13
lines
  
  Remove automatic switching from T.38 to voice mode in chan_sip.
  
  chan_sip has some code to automatically switch from T.38 mode to voice
mode when
  a voice frame is written to the channel while it is in T.38 mode; this
was
  intended to handle the situation when a FAX transmission has ended and
the channel
  is not yet hung up, but is causing problems at the beginning of FAX
sessions as
  well when there are still voice frames 'in flight' at the time the T.38
negotiation
  completes. This patch removes the automatic switchover, and changes
app_fax to
  explicitly switch off T.38 mode when the FAX transmission process ends.
  
  (closes issue https://issues.asterisk.org/view.php?id=16025)
  Reported by: jamicque
........

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http://svn.digium.com/view/asterisk?view=rev&revision=223655 

Issue History 
Date Modified    Username       Field                    Change               
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2009-10-12 09:40 svnbot         Checkin                                      
2009-10-12 09:40 svnbot         Note Added: 0112207                          
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