asterisk users - Jan 2012 - attended transfers going to wrong voicemail Asterisk 1.8 Polycom 650

Hi, I'm seeing an odd issue at a recent installation and have been unable
to resolve it.  Caller A calls Caller B and Caller B transfers to Caller
C.  Using a blind transfer, if Caller C doesn't answer then Caller A gets
Caller C's voicemail. (as expected) However if doing an attended transfer
(Caller B simply hits transfer, then transfer without announcing) then
Caller A winds up in Caller B's voicemail box if Caller C doesn't
answer.
I realize my users are misusing "attended transfer" but it still
doesn't
seem to work as expected. I have tried setting both canreinvite=no and
directmedia=no in sip.conf and it doesn't seem to make a difference.

Asterisk is version 1.8.4.2.  All phones are Polycom 650. I have another
installation that is on Asterisk 1.6 with a mixture of cisco and polycom
phones and I cannot reproduce the behavior there. Thanks in advance. If I
need to provide more information please let me know.

Thanks,
Jeff Roberts
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