[Alug] FW: h323 and smoothwall

Hi, I have Smoothwall gpl 1.0 firewall and behind it a mandrake box and a w***ows xp box (sorry) which I wish to have netmeetings on. I have found out that I need something called h232 but that's all I've found out. Any help would be great but please be gentle with me I can install linux from a disk and use vi and things but I'm not mr techy. Thanks Dave