asterisk users - Mar 2009 - Retrieve DTMF during Dial

I would like to do the following:

Dial an extension in Asterisk

The extension runs an application which dials a number (like a hybrid of 
DIAL and READ).  The dialed number is a box which does nothing but play 
DTMF tones then hangs up

The first box captures the DTMF tones to a variable

Dial exits

Dialplan continues with the variable value available.

Is this possible?

Mik