In how many ways could I connect different company for telepresence?

Hello everyone, 
I'm new in the video conference and telepresence field. 
I'd like to know how many ways there are to connect different company to make a telepresence session.
Currently I'm managing a telepresence infrastructure in which all the different location are 30 Km distant and are all part of the same intranet.
Obviously we have a VCSc and VCSe and a MCU.
If I don't have an intranet and I'd like to connect different location, how could I do? VPN? Is it possible to use just the public internet?
for example, if I have 3 location (200 km distant) and every location has an SSDL connection (down 4 Mb/s up 4 Mb/s), can I connect them?
I was thinking to use for example a VCS Espress starter pack in one location and 3 codec SX20.
Is it possible to have a 720p call considering the distances?
 

Yes, you can, but it does become a trial and error scenario.
We've been doing that for years to some very remote sites (+800kms), however, we've had to keep the b/w to 384kbps, and we do see some packet loss at times, but this mainly involves older endpoints such as MXPs, whereas the C-series and the SX endpoints handles it much better.
We're now in the process of moving these sites on to a managed 10/10Mbps connection which will allow us to implement QoS.
We also have another very remote island site where we only have a 2/2Mbps connection, and we restrict b/w to a max 512kbps to/from this site, and we haven't had any issues at all.
And these links are not used exclusively for video, but these remote sites use them for all their internet traffic.
Just on a side note, I run HD videconferences from home, but then I have a 100/40Mbps fibre connection, but it still goes across the public internet - and I haven't had any issues yet. :)
As I said at the top, it's trial and error; stress test the link at various times without VPN first, then move to VPN if needed. It's not as simple as a "yes" or a "no".
/jens
Please rater replies and mark question(s) as "answered" if applicable.

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