We actually did it over the SIPRnet - Secure IP Routing network. It's a closed system that's encrypted. The regular internet is called the NIPRnet - Nonsecure IP yada yada yada.

Bandwidth can be a problem during certain times of the day. We did the VTC last night from 5 PM to midnight. The data rate is usually 128K or 256K but sometimes we can bump it all the way up to 384K.

The stuff we use is from Polycom.
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Tent makers for Christie, 2016.