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

[Asterisk Bug Tracker]

The following issue has been SUBMITTED. 
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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:                     new
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:              2010-11-10 12:55 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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Issue History 
Date Modified    Username       Field                    Change               
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2010-11-10 12:55 cdiego         New Issue                                    
2010-11-10 12:55 cdiego         Asterisk Version          => 1.4.36          
2010-11-10 12:55 cdiego         Regression                => No              
2010-11-10 12:55 cdiego         SVN Branch (only for SVN checkouts, not tarball
releases) => N/A             
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