If you are interested in Exchange 2007 integration with PBXs, here is some more informationhttp://192.168.2.20/blogs/doverton/archive/2007/01/16/if-you-are-interested-in-exchange-2007-integration-with-pbxs-here-is-some-more-information.aspxI was wondering over Eileens blog and came to this one - Configuring your PBX for Exchange 2007 - it talks about a preview of documentation covering VoIP gateways, PBXs and gateway. Have a look at the blog and link for more info. Just as a btw, the listenCommunityServer 2008.5 SP2 (Build: 40407.4157)