Recently I had the opportunity of participating in a Pilot of Lync Server in a customer that has the internal network segregated by firewalls. So, one of the first questions was about the ports and protocols used by Lync Server.

The requirements of this pilot included:

• Co-existence with OCS 2007 R2
• Exchange 2010 Unified Messaging
• External Access
• Integration with existing video-conference infrastructure
• All the UC workloads

The ports and protocols used by Lync are pretty well documented in the following TechNet pages:

• Ports and Protocols for Internal Servers
• Reference Architecture 1: Port Summary for Single Consolidated Edge

Additionally, the Microsoft Lync Server 2010 Protocol Workloads Poster does a very good job illustrating not only the ports and protocols used by each UC workload, but also their dependencies and relationships.

Instead of letting the customer compile and aggregate all the provided technical information, we decided to provide some Visio drawings, in order to facilitate the configuration tasks of the security team. In the end we delivered the following schematics:

Please note that these were built for a pilot and not for a Production environment, thus minor errors/inconsistencies may have been depicted. If you find one, please let me know.

If you want the Visio document, it can be downloaded here.