asterisk users - Feb 2004 - Flash application on H323

I've read about a 'flash' application for Zaptel that could allow to
make
	Flash(somewhere)
	SendDMTF(remaining digits)

Is there anyway to implement that with H.323 ? and SIP ?
That's 
	Dial(H.323FXO)
	SendDMTF(remaining digits)

The main issue is that Dial doesn't return until one endpoint hangs, so I
cannot send remaining digits when dialling!

:o(

Thanks!