[asterisk-bugs] [Asterisk 0018999]: rtpkeepalive blocks incoming DTMF periodically

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18999 
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Reported By:                geejay
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18999
Category:                   Core/RTP
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.40 
JIRA:                        
Regression:                 No 
Reviewboard Link:            
SVN Branch (only for SVN checkouts, not tarball releases):  1.4  
SVN Revision (number only!): 308580 
Request Review:              
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Date Submitted:             2011-03-19 06:21 CDT
Last Modified:              2011-03-23 09:21 CDT
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Summary:                    rtpkeepalive blocks incoming DTMF periodically
Description: 
When rtpkeepalive is not zero then comfort noise packets are sent
periodically. During sending of comfort noise packets incoming DTMF is not
processed.

These DMTF tones are lost.

The Function ast_rtp_sendcng in rtp.c mutes DTMF for a certain period
here:
rtp->dtmfmute = ast_tvadd(ast_tvnow(), ast_tv(0, 500000)); 

DMTF tones received during this period are not processed by Asterisk. 

I verified the problem in Asterisk 1.4.40. The code 1.6.2.17.1 seems to be
the same.
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 (0133091) rsw686 (reporter) - 2011-03-23 09:21
 https://issues.asterisk.org/view.php?id=18999#c133091 
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This could be related to 0018784 or 0018764, which affected DTMF
processing. One was due to the silence generator being added. Both of these
issues for me were resolved by issue 0015642 with revision 310888 for 1.4
"Don't delay DTMF in core bridge while listening for DTMF features". 

Issue History 
Date Modified    Username       Field                    Change               
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2011-03-23 09:21 rsw686         Note Added: 0133091                          
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