[asterisk-bugs] [Asterisk 0018189]: RFC2833 DTMF generation broken due to SSRC change on bridges channels

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18189 
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Reported By:                marcbou
Assigned To:                jpeeler
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Project:                    Asterisk
Issue ID:                   18189
Category:                   Core/RTP
Reproducibility:            always
Severity:                   block
Priority:                   normal
Status:                     assigned
Target Version:             1.8.1
Asterisk Version:           1.8.0 
JIRA:                       SWP-2473 
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:             2010-10-22 12:13 CDT
Last Modified:              2010-12-06 14:47 CST
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Summary:                    RFC2833 DTMF generation broken due to SSRC change on
bridges channels
Description: 
Since upgrading to the latest 1.8.0-rc, DTMF digits sent over SIP/RTP to
our service provider were no longer being detected.

We analyzed packet dumps, comparing old and new RTP packets being
generated by asterisk.

The difference was tracked down to asterisk 1.8.0-rc now changing the SSRC
value for RFC2833 DTMF digit packets.

If in main/channel.c:ast_channel_bridge() I comment out 

    ast_indicate(c0, AST_CONTROL_SRCCHANGE);
    ast_indicate(c1, AST_CONTROL_SRCCHANGE);

the SSRC no longer changes for DTMF digits and the provider can detect
them again.

However I am not sure if the change doesn't adversely affect other things.
Please advise.

Kind regards,

Marc Boucher



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Relationships       ID      Summary
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related to          0018352 SSRC is changing when DTMF sent
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 (0129367) cmbaker82 (reporter) - 2010-12-06 14:47
 https://issues.asterisk.org/view.php?id=18189#c129367 
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We were only able to leave it that way for less than one day, but no one
complained of the delay during that time frame, and we were unable to
reproduce it during that time either.  However given how random that delay
is I cannot guarantee that it fixed the delay.   We're using all polycom
IP330 and IP450's. 

Issue History 
Date Modified    Username       Field                    Change               
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2010-12-06 14:47 cmbaker82      Note Added: 0129367                          
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