This article describes how you can setup a proxy server on an existing Microsoft IIS Server in your company to tunnel the ShoreTel Communicator for iPhone App calls to your internal ShoreTel server. ShoreTel was so kind to document this with Apache, but not with IIS. If you do not like to run Apache as an extra instance in your company only for the ShoreTel App you can follow this document and save your time as this solution is really easy to implement.
Installation