OCS Edge server configuration

I have recently referred this link for the OCS edge server configuration -

OCS Edge Server Configuration Topologies –(Non MS Links)

https://blogs.pointbridge.com/Blogs/schertz_jeff/Pages/Post.aspx?_ID=19

https://www.shudnow.net/2009/01/20/office-communications-server-2007-r2-enterprise-deployment-part-5/