asterisk users - Jan 2012 - message WARNING features.c: Failed to play transfer sound! and attended transfer hangs up

Hello Folks!
I?m trying attended transfer with asterisk 1.6 and see the message
"WARNING[] features.c: Failed to play transfer sound!" once in a while
when
the transfer failes.

Any idea what can be happening?

Thanks a lot!!!
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> I?m trying attended transfer with asterisk 1.6 and see the message
> "WARNING[] features.c: Failed to play transfer sound!" once in a
> while when the transfer failes.
> 
> Any idea what can be happening?
Asterisk tried to play the features.conf xfersound configured sound file.
By default this is the beep sound.  It is likely that the channel was
hung up when Asterisk was trying to play the sound file.

Richard