Taken from Microsoft UC Team:
The RTC Sustained Engineering Team has signed off and published the July update packages for R2!
Updates for Communications Server 2007 R2
Update for Communicator 2007 R2: July 2009
Office Communicators Server 2007 R2 Attendant hotfix rollup package: July 2009
Office Communicator 2007 R2 Phone Edition update: July 2009
1. The Knowledge Base articles are being published and all should be available within 24 hours.
2. All of these patches are now available via Microsoft Customer Support Services (specifically, the Unified Communications Support Team), except for the Communicator Phone Edition R2 release, which is available via web download.
3. We will also have the OC 2007 R2 on Microsoft Update today. The OCS 2007 R2 (server update) will not be on Microsoft Update due a dependency on the back-end fix that cannot be delivered via Microsoft Update.
4. KB 968802 is a rollup of all OCS 2007 R2 released patches. This KB article will be continuously updated as newer patches are released.