[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
Target Version:             1.6.2.10
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:              2010-07-09 10:44 CDT
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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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 (0124390) eeman (reporter) - 2010-07-09 10:44
 https://issues.asterisk.org/view.php?id=15642#c124390 
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just tested 1.6.2.9 and 1.6.2.10-rc1 with a Sonus switch with broadvox and
it failed. Attached is a capture file while doing an interop test. the
scenario is I am calling another TN where an asterisk box has a READ
application that captures the DTMF digits and spits them back:


handset -> [Asterisk 1.6.2.9] -> [Asterisk 1.6.2.9] -> Broadvox Sonus ->
PSTN

the testing diagnostic side:
[PSTN via PRI] -> [Asterisk 1.4.26.3] -> READ & SayDigits macro


then I tried:

handset -> [Asterisk 1.6.2.9] -> [Asterisk 1.6.2.10-rc1] -> Broadvox Sonus
-> PSTN

after another failure I decided to upgrade everything to 1.6.2.10-rc1

handset -> [Asterisk 1.6.2.10-rc1] -> [Asterisk 1.6.2.10-rc1] -> Broadvox
Sonus -> PSTN


In my test I dialed 1 through 9 followed by # twice in the test. If you
listen to the media stream with wireshark you will hear the playback and
how various digits are just missing. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-07-09 10:44 eeman          Note Added: 0124390                          
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