asterisk users - Mar 2009 - E&M signalling

I'm trying to implement E&M type V over a T1 and have not had much luck.

Type V sends 1's when on-hook and 0's when off-hook (for a little
background) which is the reverse of type II, which is what the e&m keyword
in zaptel.conf gives.

The closest I have gotten is to set the channels to cas or user in zaptel.conf
(cas = 42-71:1111) which will send all 1's on-hook, but I can't find any
keyword for Zapata.conf that will work with this.

Help is much appreciated

--Norbert