Last week I was up in Norway delivering an OCS R2 Ignite, and the question popped up if there was any link/document or something available that describes in detail the so-called Firewall Requirements to enable External User Access in an OCS 2007 R2 deployment.

The following link to Microsoft TechNet - Office Communicatons Server describes the requested information very clearly :-) and provides tables to:

• Firewall Settings for the Access Edge Service
• Firewall Settings for the Web Conferencing Edge Service
• Firewall Settings for the A/V Edge Service
• Firewall Settings for the Reverse Proxy

Here's the link: Firewall Requirements for External User Access

-Ilse