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VCS Expressway/DNS Design Question for Dual Internet Connections in Different Continents

We have two UC 9.1 Clusters, one in Europe and one in USA. CUCM's would run ILS between them. Each continent has an internet connection. We're thinking of having SRV/A-Records for pointing to the US Expressway and pointing to the Europe Expressway. Video end-points in each continent would register to their respective UC cluster. While we plan on clustering our VCS Control/Express in each continent, we're wondering about how best to handle re-routing in the case of a continent's internet access being down.

1) Instead use, and deploy global load-balancers?

2) Instead use and use external/third-party load-balancing service?

3) Something else?


As a general question, if someone were to dial but the johndoe end-point is off of the EU CUCM and the call comes into US Expressway/Control, then to US CUCM; does the US CUCM (utilizing knowledge from ILS) just do a re-direct internally to the EU CUCM to complete the video call, or would it send a re-direct back out to the external caller and redirect it to


Thanks for any insight- I'm a UC guy just getting into the video world.