I done some implementation by the recommended solution in the doc. That is, via opening the ports recommended in the external and internal firewall, after much session convincing the Security guys on the public-routable address on the external NIC of the AV server.
But It occurs to me that some organisation may not be able to compile when their policies is to make use of VPN or SSL VPN means and not using ISA means. Would it still be possible to connect an external machine via VPN or SSL VPN to an edge on the DMZ for voice and audio??
anyone have any views/insight to this?