asterisk users - Sep 2003 - Hanging up one call when you have call waiting

I would like to do the following:

"A" calls "B"
"C" calls "A"
"A" hears call waiting beep and flashes the line to
talk to "C"
::Here's where I run into a problem::
"A" hangs up on "C" and immediately returns to a
conversation with "B"

The only way I have got this to work is if "C" hangs
up.  Then "A" is connected to "B".  If I hit flash for
a second time, then it becomes a three way call.

Is there a key sequence to hang up one of the calls?

Thank you for your time.

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