[asterisk-bugs] [Asterisk 0019103]: SIP faxdetect does not work when using g729 codec

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=19103 
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Reported By:                darkbasic
Assigned To:                
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Project:                    Asterisk
Issue ID:                   19103
Category:                   General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.8.3.2 
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:             2011-04-12 08:10 CDT
Last Modified:              2011-04-12 08:27 CDT
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Summary:                    SIP faxdetect does not work when using g729 codec
Description: 
I am using T.38 termination with Eutelia provider, I can receive faxes
flawlessly using g729, but fax detection does not work with g729 (it works
when using alaw).

I get this WARNING: Inband DTMF is not supported on codec g729. Use
RFC2833

I attached full log.
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 (0133635) davidw (reporter) - 2011-04-12 08:27
 https://issues.asterisk.org/view.php?id=19103#c133635 
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Asterisk is behaving perfectly reasonably. As you mentioned T.38, you will
not be using G.729 for the actual faxes, and it wouldn't work if you did. 
Asterisk is perfectly correct in saying that inband tone detection is not a
reasonable expectation for G.729.

I think the only bug here is a misleading error message.  It's probably
looking for fax calling tones, not for DTMF, and therefore can't take
advantage of RFC 2833.

I think you need to take this to a support channel. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-04-12 08:27 davidw         Note Added: 0133635                          
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