Настройка публикации Communicator Web Access через Microsoft ISA Server 2006

Ссылка на сайт MS:

http://technet.microsoft.com/en-us/library/bb905860(office.12).aspx

И доп материал:

If you want authenticate user using ISA, your internal cwa web site should enable Windows authentication mode. Because internal type CWA site does not support Windows Auth., you need create an addtional CWA site via CWA management console.

When "create virtual web server" in cwa cosole, you shoulde choose virtual server type as "Internal" and select "Integrated" authentication mode. And also you need one more different ip or port for this virtual server for not confilcting with original server. Then you need publish this web site out in ISA.

Источник: 

http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/MS_Live_Communications_Server/Q_24736801.html