Silly lad, the walls have ears. And the ceilings, trimwork, light fixtures, heating ducts, etc.
Think outside the (secure) box, dude.
Well, of course those are the conventional channels, and for sure some of them would have been employed. But an all-around secure communications infrastructure would have to include the telephony, or else all of the other precautions can more or less be CALEA'd away 9ie, using the physical infrastructure of CALEA).
And there's also the question of willing "our boys" would be of incurring some international incident by installing eavesdropping devices. Something CALEA-like seems far less instrusive.
Of course, there's laser-based eavesdropping from the outside of the building, and I'd bet this was actually the method used in many cases. Laser/vibration-proof glass apparently does exist (it's installed in that DARPA building in downtown watchamaface VA), but I doubt it's installed in the UN, as it's VERY expensive. (But then again, maybe some select rooms have it.)
-TD
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