TechContrarian

Hooray! Office Communications Server 2007 R2 XMPP Gateway Has Been Released
This article walks you through setting up the XMPP Gateway and configuring it to work with Jabber XCP 5.4. For those who have been anticipating this release, I am happy to say, here it is, and it’s been worth the wait if you require Jabber or GMail connectivity.
You will be required to complete the following steps to successfully configure Office Communications Server 2007 R2 XMPP Gateway with Jabber XCP 5.4.
1.   DNS Configuration
2.   Office Communications Server Edge Configuration
3.   Office Communications Server XMPP Gateway Configuration
4.   Jabber XCP (s2s Configuration)
Environment Requirements

Enable your current environment to work with the new Office Communications Server 2007 R2 XMPP Gateway
Office Communications 2007 R2 Edge Server
Permissions to request a server certificate from a private or public certification authority.
Permissions to create DNS records in your internal Enterprise, as well as public DNS servers
Windows 2003 [...]