Telco vendors have been using Openstack for 6-8 years already, and virtualization (and even containerisation, mainly with LXC, or Solaris zones earlier) was a thing back then.
Kubernetes is also used for the last couple of years, mainly inside their VNF-s, so the transition to CNF-s is not a "sudden" thing, most modern VNF-s were running a Kubernetes cluster inside virtual machines already.
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