[asterisk-bugs] [Asterisk 0018289]: Dropping incompatible voice frame on Local/ on multiple atxfer a->b->c...->d...

[Asterisk Bug Tracker]

A NOTE has been added to this issue. 
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https://issues.asterisk.org/view.php?id=18289 
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Reported By:                cdiego
Assigned To:                
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Project:                    Asterisk
Issue ID:                   18289
Category:                   Channels/General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     feedback
Asterisk Version:           1.4.36 
JIRA:                        
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:             2010-11-10 12:55 CST
Last Modified:              2011-01-18 09:53 CST
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Summary:                    Dropping incompatible voice frame on Local/ on
multiple atxfer a->b->c...->d...
Description: 
Multiple warning messages on Asterisk 1.4.36: Dropping incompatible voice
frame on Local/....

when receiving calls with codec A and doing multiple attended transfers to
codec B

The first atxfer is ok.

Reproduced with the following channel combinations

SIP -> SIP -> SIP...
IAX -> SIP -> SIP...
DAHDI -> SIP -> SIP..

Tested in different systems witch I've upgraded from 1.4.22 to 1.4.36,
tested with different codecs.

g729 -> alaw
ilbc -> alaw
alaw -> ilbc
alaw -> g729
...

Tried to set transcode_via_sln=no and restarting *, it has no effect.

moh files in wav format, also tried moh files in multiple formats to avoid
transcoding..

===============
Test Multiple call transfer
===============

A with codec X calls  B with codec Y

B answers the call

B attended Transfer to C -> Ok

C attended Transfer to D -> Multiple warning messages 139.... 150 Dropping
incompatible voice frame on Local/

D attended Transfer to E -> Multiple warning messages 139.... 150 Dropping
incompatible voice frame on Local/

...

[Nov 10 16:12:38] NOTICE[4463] channel.c: Dropping incompatible voice
frame on Local/413 at ramais-administrativo-81ea,2 of format slin since our
native format has changed to 0x8 (alaw)
...
[Nov 10 16:12:38] NOTICE[4463] channel.c: Dropping incompatible voice
frame on Local/413 at ramais-administrativo-81ea,2 of format slin since our
native format has changed to 0x8 (alaw)

Can it cause a problem to asterisk?

I have about 7K to 10K of this warning messages per day in all my systems
with 1.4.36 version.



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---------------------------------------------------------------------- 
 (0130600) lmadsen (administrator) - 2011-01-18 09:53
 https://issues.asterisk.org/view.php?id=18289#c130600 
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Please provide the debugging information from the console, along with the
configuration files you're using, and the SIP trace for the SIP scnearios
(along with SIP history enabled). We'll need this information in order to
reproduce the issue and see what is going on. 

Issue History 
Date Modified    Username       Field                    Change               
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2011-01-18 09:53 lmadsen        Note Added: 0130600                          
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