By the way ... if you are looking for a local Proxy Server, take a look at CCProxy. It's not something I would use for a large corporate network (it seems to have a limit of max 1200 concurrent connections), but it is lightweight and easy to configure, which made it my 1st choice for testing the RTC SDK:
http://www.youngzsoft.net/ccproxy/Best Regards,
Danijel Tkalcec