<div dir="ltr">You can run 5.1 or 5.5 with CUCM 10.x. And if you have multiple hosts, they don't all have to run the same version. They don't even have to be sized the same. Though it might make logical sense to do so, for support and ongoing operations reasons.</div><br><div class="gmail_quote"><div dir="ltr">On Mon, Aug 17, 2015 at 9:20 PM Voice LabGuy <<a href="mailto:voicelabguy@gmail.com">voicelabguy@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><p dir="ltr">Got call manager cluster 10.x running on Esxi 5.1. I'd like to add more servers to the cluster using a separate host. Is it ok to run esxi 5.5 on the new box or anything suggests against it? i.e. It has to be 5.1 to match? <br>
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