This design guide contains valuable information directly relating to your question. I'll try to hit on a couple of points. The first thing is if your existing bandwidth coming out of that site is 20Mbps and you are running your normal network traffic out of this link, then running the TelePresence at 15Mbps will most likely cause troubles on the connection even if your carrier allows you to burst. Cisco recommends a "33% LLQ Rule" if your TelePresence is sharing a link with normal network traffic. If this is a dedicated link, then you should be ok with 20Mbps depending on your TelePresence configuration.
The amount of bandwidth the TelePresence unit uses can be modified based on the resolution and motion handling you specify for the TelePresence unit. If you add a Presentation codec to allow you to display 30 frames per second for presentations, this will require additional Bandwidth. If you are running at the latest version of code, you should be able to setup traffic shaping on your outbound interface to prevent bursting. Traffic shaping will not work very well when using older versions of code Prior to 1.5.
So, my recommendation is review this document. Then based on the amount of bandwidth you intend to dedicate to the TelePresence traffic, determine if there is a resolution/motion handling combination that will meet your bandwidth goals. If not, then you may want to consider adding to the 20Mbps link.
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