We currently have a C90 and are able to sucessfully connect to a far site C90 unit but are unable to connect ot any of the Polycom test IPs here:
Have these IP addreses expired?
http://support.polycom.com/PolycomService/support/us/support/documentation/video_test_numbers.html
You might try my test site... It's normally up all the time but we did have a 3 hour power failure (Storms) this morning..
71.14.2.157
71.14.2.158
Give it a try.
Gary M