[asterisk-bugs] [Asterisk 0010441]: RTCP Read Too Short generate strange DTMF tones on call.

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=10441 
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Reported By:                ygor
Assigned To:                
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Project:                    Asterisk
Issue ID:                   10441
Category:                   Core/RTP
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.10  
SVN Branch (only for SVN checkouts, not tarball releases):  1.4  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             08-13-2007 13:24 CDT
Last Modified:              08-28-2007 10:28 CDT
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Summary:                    RTCP Read Too Short generate strange DTMF tones on
call.
Description: 
Randomly Asterisk starts to issue messages like that:

[2007-08-13 15:33:54] WARNING[31849]: rtp.c:887 ast_rtcp_read: RTCP Read
too short

and the people hears some DTMF tones on the line.

We have detected that this occurs generally on Linksys PAP2-NA and Linksys
PAP2-T when using G729 codec.

Also I got this trouble on some IAX2 gsm trunks.

It appears to be randomly generated and sometimes it floods the CLI with
this message. ( generally when somebody inject DTMF tones on the call ).

This issue can be directly linked to the following Asterisk Forum post:
http://forums.digium.com/viewtopic.php?t=13114&highlight=&sid=949335ae5d5eddc10771bea0d7443599

Also from time to time, I get the "RTP Read Too Short" message too.

No jitterbuffers are used on my environment at the moment.
My asterisks are trunked on a voice-only network ( Motorola Canopy ).
There is absolutely no packet losses between the servers.
My environment is mixed, so I have SIP and IAX2 connections coming from
several places.
I generally use alaw, g729a and gsm codecs.
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---------------------------------------------------------------------- 
 ygor - 08-28-07 10:28  
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The errors keep going, most notably RTCP Read Too Short, but I also get
random RTP Read Too Short Messages.

Currently updated Asterisk to 1.4.11 built on i686 - Core 2 Duo 6400 @
2.13GHz

gcc version 4.1.3 20070812 (prerelease) (Debian 4.1.2-15)

Running on Debian Lenny (testing) with latest updates.


I think it is something related to Packet Loss on Network.

I think a little more information on the error would be useful, something
like the IP Address or peer related to the error so we can trace the
network as we have lots of peers on the server.

Something like:


[2007-08-13 15:33:54] WARNING[31849]: rtp.c:887 ast_rtcp_read: RTCP Read
too short for 255.255.255.255/24, SIP peer: 10122020


Thanks 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
08-28-07 10:28  ygor           Note Added: 0069558                          
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