asterisk users - Mar 2010 - ooh323_indicate: Don't know how to indicate condition 20

I've got Asterisk 1.6 bridging to an Avaya using H323.  The Avaya is
autoanswering calls to music (as expected) and audio seems fine, but I see
this error on bridging:
 
WARNING[8833]: chan_ooh323.c:1054 ooh323_indicate: Don't know how to
indicate condition 20 on ooh323c_o_2
 
Is this a warning I should be concerned about? What does condition 20 mean?
 
Thanks!
Michelle
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