asterisk users - Jan 2011 - Call parking question

I've been playing with call parking in Asterisk 1.8.1.  I'm able to park
a
call and then pick it back up.  However, on the second attempt, the #72 DTMF
is ignored.  Asterisk just passes that DTMF on to the caller and the call
parking never happens.  Shouldn't I be able to park a call more than once?

-- 
Chris
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