[asterisk-bugs] [Asterisk 0014849]: SendFax function not working as expected on > 1.6.0.7

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=14849 
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Reported By:                afosorio
Assigned To:                
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Project:                    Asterisk
Issue ID:                   14849
Category:                   Channels/chan_sip/T.38
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     new
Asterisk Version:           1.6.0.7 
Regression:                 No 
SVN Branch (only for SVN checkouts, not tarball releases): 1.6.0 
SVN Revision (number only!):  
Request Review:              
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Date Submitted:             2009-04-07 15:51 CDT
Last Modified:              2009-05-03 03:40 CDT
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Summary:                    SendFax function not working as expected on >
1.6.0.7
Description: 
When trying to send a fax via callfile using T.38 in asterisk version
1.6.0.5 it works fine, but after upgrading to asterisk 1.6.0.7 or newer it
does not work. When receiving re-INVITE from media gateway (Cisco AS-5400)
Asterisk ends call answering 488 Not acceptable here. I am running Asterisk
under Debian kernel 2.6.18-6-686. I am attaching captures both for scenario
which works and scenario which does not work. 
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 (0104067) dimas (reporter) - 2009-05-03 03:40
 http://bugs.digium.com/view.php?id=14849#c104067 
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vrban ,
"And my opinion is, that if we get a call to the ReceiveFAX application
from a SIP channel, i dont see any reason why a SipT38SwitchOver should not
be hard coded?"
Before stating this you read T38 specifications of course? Because last
time I read it, it was saying that receiving end should initiate switchover
when it hears CNG...

Also, last time I tried, Callweaver on sending  side was terminmating the
call if Asterisk on receiving side did T38 reinvite right at the beginning
of ReceiveFAX.

And your comment about SendFax is meaningless - again, it is up to
RECEIVING end to offer switchover not sending one. Send fax does not "look
into audio" at all. If you check the code you will find that CNG detection
is done only for receive mode (that is ReceiveFAX). If /asterisk is the
sender - it will do switchover as soon as it gets proper INVITE. (It least
it was doing that when I was trying half an year ago) 

Issue History 
Date Modified    Username       Field                    Change               
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2009-05-03 03:40 dimas          Note Added: 0104067                          
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