1.4.36 – Warning Dropping incompatible voice frame on Local/ on multiple atxfer a->b->c…->d…

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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@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@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.