Since MS TMG server was withdrawn from the marked, IIS ARR has become the most common solution to publish Lync, Exchange and Sharepoint solutions.
There are good guides on how to configure IIS ARR and hos to publish Lync 2013.
One thing that I have been noticing, is that mobile users have been complaining about the following Message: “Your server configuration has changed. Please restart Lync”
After some searching on the topic, there was some info that told us to increase the Proxy Timeout value.
One very important info is:
You will need to increase the Proxy Timeout value for the Web External Publishing Rule.
I have had success with increasing the value to 960 Seconds.