One to one NAT, aliased IP's, and Net Meeting. H.323 not needed?

[Michael Steele]

Hello,
Theoretically shouldn't NetMeeting work with no special H.323 routing?
If I have the following:
        An aliased public IP
        One to one NAT.  
        This aliased public ip only points to a private ip serving Net
Meeting.

My linux box listens to multiple public IP's.  One aliased public IP
represents an internal ip running Net Meeting.  Every service works so
far except NetMeeting on that internal IP machine.  Why would I need
special routing H.323(if I do) if I have a aliased public ip assigned to
an internal ip through Pre and Post routing?  Do I?

Thanks for an help.