Full duplex on 701cs

["Greg A." <slppj@cc.usu.edu>]

Hello,
  here's my problem.   The manual claims  that the sound in the 701cs 
is full duplex.  However I've been unable to find an internet voice chat
program that will recognize the sound card as such.  The only program
that's been able to utilize full duplex on this 701cs is the
fax/telephony program that came with it, and I understand that this
particular vesion of faxworks is written specifiaclly for the 701s.  Has
anyone had any luck getting full duplex out of the 701cs with anything
besides the Faxworks program it came with?  I'm hoping I can find an
internet voice program that will be able to utilize full duplex.
Thanks 
-Greg Alvandian