[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:                     assigned
Asterisk Version:           SVN 
JIRA:                       SWP-2728 
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:              2011-03-02 14:55 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...
related to          0017404 [patch] [regression] audio delay when b...
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 (0132538) twilson (administrator) - 2011-03-02 14:55
 https://issues.asterisk.org/view.php?id=15642#c132538 
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djensen99: I've been testing with a SIP phone registered to an Asterisk box
with a broadvox account registered. Without the patch, I get about 50%.
With it, it has been 100%. I tested with a couple of numbers one of which
is 804-222-1111. Instructions: http://www.testcall.com/222-1111.html. 
Basically as soon as it is done reading your 7 digit callerid back, press
keys and it reads them back to you (make sure you start before the
"testcall.com" announcement which signals that it is hanging up.

I suppose it could be a DAHDI<->SIP-specific issue...

globalnetinc: things still good with your tests? 

Issue History 
Date Modified    Username       Field                    Change               
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2011-03-02 14:55 twilson        Note Added: 0132538                          
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