[asterisk-bugs] [Asterisk 0015642]: [patch] Fix for Sonus DTMF issues

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=15642 
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Reported By:                jasonshugart
Assigned To:                twilson
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Project:                    Asterisk
Issue ID:                   15642
Category:                   Core/RTP
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     ready for testing
Asterisk Version:           SVN 
JIRA:                       SWP-406 
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:             2009-08-03 12:28 CDT
Last Modified:              2010-12-07 17:18 CST
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Summary:                    [patch] Fix for Sonus DTMF issues
Description: 
In some cases when Asterisk sends DTMF to Sonus platforms as RFC2833, Sonus
will not recognize the DTMF.  Several articles have identified the problem
as being the gap in the audio prior to the DTMF packets being sent.  This
patch sends a single G.711 ulaw packet prior to the rfc2833 packets.  In
our testing across with two carriers (Level3 and 360 Networks) this patch
fixed our DTMF issues.  The rtp.c file seems very similar for the 1.4
branch, so minor changes could also be applied there.  I added an option to
the rtp.conf file to enable this fix, called rtpfixdtmf.  Attached are both
the rtp.c fix, and the rtp.conf change.
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Relationships       ID      Summary
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has duplicate       0016625 RFC2833 DTMF is not passed correctly wh...
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 (0129452) zktech (reporter) - 2010-12-07 17:18
 https://issues.asterisk.org/view.php?id=15642#c129452 
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Is there any easy way to notify cmbaker82 and others that were watching bug
18189 and 18352 so we can pull them in for testing of this to see if it
resolves their issues as well. This is big for us and I have been trying to
come up with a resoltion for a year now I wish I had found this post
sooner.

Also why does the timing issue seem to be worse when using the g729 coder.
Is there an issue when transcoding that would compound the issue. This is
what I am seeing in my packet captures. 

Thanks 

Issue History 
Date Modified    Username       Field                    Change               
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2010-12-07 17:18 zktech         Note Added: 0129452                          
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