[asterisk-bugs] [Asterisk 0016793]: T.38 session fails with '488 Not acceptable here' if within 5 seconds there is no "SIP 100 Trying" REINVITE reply from remote

[Asterisk Bug Tracker]

The following issue has been UPDATED. 
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https://issues.asterisk.org/view.php?id=16793 
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Reported By:                rlr2maverick
Assigned To:                
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Project:                    Asterisk
Issue ID:                   16793
Category:                   Applications/app_fax
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.6.1.14 
JIRA:                       SWP-890 
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases): 1.6.1 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2010-02-09 09:10 CST
Last Modified:              2010-02-22 15:42 CST
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Summary:                    T.38 session fails with '488 Not acceptable here' if
within 5 seconds there is no "SIP 100 Trying" REINVITE reply from remote
Description: 
Good morning,

our setup is based on asterisk 1.6.1.14 & spandsp 0.0.6-pre17. We're
always receiving fax with no error.

When sending we're experiencing a quite strange chan_sip codecs
negotiation, selecting ulaw (8kbit??? with fax @14400 ???) even if slin is
preferred and available.

At the first write (TSI) from asterisk to the channel remote side (fax)
we're encountering HDLC carrier down and the transmission never takes
place.

T38 nego can't proceed and fax is never sent.

Is there any experience to share ?

Indeed,
RLR
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 (0118361) lmadsen (administrator) - 2010-02-22 15:42
 https://issues.asterisk.org/view.php?id=16793#c118361 
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Updated subject per reporter. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-02-22 15:42 lmadsen        Note Added: 0118361                          
2010-02-22 15:42 lmadsen        Summary                  T38 flow states HDLC
carrier immediately down when writing TSI to fax, but were up => T.38 session
fails with '488 Not acceptable here' if within 5 seconds there is no "SIP 100
Trying" REINVITE reply from remote
2010-02-22 15:42 lmadsen        Description Updated                          
2010-02-22 15:42 lmadsen        Additional Information Updated                  
 
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