[asterisk-bugs] [Asterisk 0017253]: Inband DTMF Double digits being sent.

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=17253 
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Reported By:                kenlee
Assigned To:                
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Project:                    Asterisk
Issue ID:                   17253
Category:                   Core/RTP
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Asterisk Version:           1.6.1.18 
JIRA:                        
Regression:                 No 
Reviewboard Link:           https://reviewboard.asterisk.org/r/625/ 
SVN Branch (only for SVN checkouts, not tarball releases): N/A 
SVN Revision (number only!): 230383 
Request Review:              
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Date Submitted:             2010-04-27 12:01 CDT
Last Modified:              2010-04-27 12:04 CDT
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Summary:                    Inband DTMF Double digits being sent.
Description: 
When dtmfmode is set to inband for SIP, and a zap channel is bridged with
the SIP channel, and the user on the zap channel side presses a digit, you
can hear the DTMF digit twice in the audio stream. This happens while
Asterisk is parsing the DTMF. For a fraction of a second, while the end
user generated DTMF is being detected, the DTMF is passed inband. Once the
DTMF is detected Asterisk silences it and regenerates it. Sensitive
machines like auto attendants pick up both the brief end user generated
tone as well as the full length asterisk generated tone and ultimately
perceive each digit twice.
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 (0120997) kenlee (reporter) - 2010-04-27 12:04
 https://issues.asterisk.org/view.php?id=17253#c120997 
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Related issues:
 	
0009382, 0011968, 0016243

Note that 0016243 was closed as per my testing incorrectly.  What occurred
was a significant redesign in main/dsp.c that brought the problem from a 5%
error rate that was audible by the human ear to a 1% error rate that is not
audible by the human hear.  This is why i mistook it as a fix. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-04-27 12:04 kenlee         Note Added: 0120997                          
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