AirPlay Mirroring from 10.8 Won't Start Sending Video (or Audio)

This question may have been answered, but searches for me keep coming up with people who don't have the AirPlay Mirroring icon showing up in the menu bar, which isn't the problem I'm having.
In my case, the Mac is compatible (latest-gen Air, 10.8.5), and the Apple TV (3rd gen, latest software) shows up in the list in the menu bar and Displays pref pane (as well as the Sound Output pref pane).
However, if I select the ATV, the Mac's screen resolution will change to what looks like 1080p with no corresponding response on the ATV (I have it set to conference room mode), and the right side of the menu bar and Displays pref pane both hang on a beachball for a consistent period of about 15 seconds. After a fixed timeout, the AirPlay Mirroring request is cancelled and the Mac goes back to the default resolution and no mirroring setup.
A smiliar thing happens if I select the ATV in the Sound Output pref pane--no sound from the ATV, and the pref pane hangs on a beachball for a while before eventually switching back to the internal speakers.
The devices are both on the same WiFi network, which shouldn't be overloaded or have any interference, but it is a corporate network, so I'm assuming that there is some port or protocol being blocked that is interfering with the actual mirroring connection even though the discovery is working okay.
My question, then, is:
1) Is there anything I'm overlooking that would cause this to work?
2) Assuming no, does anybody know what port might be blocked that would cause this behavior? I want to know what, specifically, I'm complaining about when I go to the higher-ups in the IT department to try and get it bypassed.

Hi felix69,
Welcome to the Apple
Discussions
iChat uses ports above port 1024 and consequently
like an On-line game needs these ports enabled in the
modem and any router you have..
iChat also uses the Quicktime Streaming speed and
this needs to be set to 1.5Mbps/T1/LAN in System
Preferences > Quicktime > Streaming tab
Can you tell us what you have done so far ?
11:22 PM Wednesday; February 14, 2007
Thanks for reply - my user name now was felix69 but I am now helenowen (sorry)! I hadn't replied because I managed to ichat my sister with no problems!! But alas trying to connect with my Dad's ibook I am having no luck in successfully communicating via ichat. I am oerating on the 1.5Mbps/T1/LAN. How do I check that i am running on ports 1024 or above??
Cheers
Would aprecite prompt reply as trying to ichat today!!!
H

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Welcome to the Apple Support Communities!
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Message was edited by: SDMacuser
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AirPlay Mirroring from 10.8 Won't Start Sending Video (or Audio)

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