asterisk users - Jul 2007 - Outpulse with Asterisk

Hi,
I want to make sure I'm clear on something.    All of the phone
systems we have setup have been either analog lines, or PRI lines.  We
have a customer who is going to use a T1 line with 4-digit outpulse.
Do I need to do anything special to get Asterisk to recognize the
outpulse, or will it just work like DNIS does?