asterisk users - Nov 2010 - 1.4.36 - Warning Dropping incompatible voice frame on Local/ on multiple atxfer a->b->c...->d...

Hi

Does anyone have the same problem, or know the solution?

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

Reproduced with the following channel combinations

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

Tested in different systems that 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.

-- 
Carlos Diego Russo Medeiros
iTFLEX Tecnologia - softwarelivre redes seguran?a
http://www.itflex.com.br - Joinville/SC - Brasil