[Asterisk-Users] Newbie question - pickup call waiting on an analog trunk

[Daina Hopper]

I have a TDM31B with one FXO port.  The phone company provides call waiting
and the ability to "switchover" to that party.  My problem is that now that
I'm running it through asterisk, if I'm on a call and I get another call, I
get the caller id info and the tones, but I can't switchover (via
flashhook).  What am I missing?  I've looked all over wiki and the archives
to no avail, any help would be greatly appreciated.