Posts in this forum at Broadbandreports.com suggest that it is quite easy to hook up a Cisco ATA-186 VOIP gateway to an ordinary PBX. This would be really neat. The only question is: can several of these units coexist gracefully behind a NAT? I suspect the answer is yes, but it may require some tweaking. If so, then small offices could install a couple of these for making outgoing long distance calls super-cheap. And of course, the more people that have IP phones, the more people who can call each other absolutely free.