The OCS team has now made a Remote Connectivity Analyzer, like we know from Exchange. The tool is a great way of verifying that your remote access is configured properly.
The Office Communications Server Remote Connectivity Analyzer is a great tool for performing testing, troubleshooting, and diagnostics on OCS 2007 & OCS 2007 R2 deployments. The tool will assist you in finding answers to the before mentioned scenarios. You should use the RCA as your initial stop when attempting to troubleshoot an OCS edge server connectivity issue.
The Office Communications Server Remote Connectivity Analyzer is a web site for IT Administrators to validate and diagnose end-to-end Office Communications Server scenarios. The site simulates multiple Office Communications Server client access scenarios from outside the customer’s infrastructure and reports whether the test was successful. If the test fails, we inform the IT Admin exactly where in the process it failed as well as provide troubleshooting tips on resolving the issue.
The OCS Remote Connectivity Analyzer is found here. Right now the tool is still a BETA release.